Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
nuoc sach » nguoi sach, hoc sach, cuoc cach
toc sach » hoc sach, thuoc sach, toc san
va thanh » gia thanh, ban thanh, va tinh
doc sach » hoc sach, dac sac, bo sach
nam truc » nam truoc, nam thuc, nam trung
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
va nam » van nam, ha nam, va nay
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((toc sach) OR (nuoc sach))) or (doc sach)) y nang ma hoi. hieu va nam truc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((toc sach) OR (nuoc sach))) OR (doc sach)) y nang ma hoi. hieu va nam truc va thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((toc sach) OR (nuoc sach))) or (doc sach)) y nang ma hoi. hieu va nam truc va thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((((toc sach) OR (nuoc sach))) or (doc sach)) y nang ma hoi. hieu va nam truc va thanh dai cua tre*.