Perhaps you should try some spelling variations:
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hanh de » hanh ve, hanh kem
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
tuc va » thuc va, tuc xa, duc va
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang x hoi. hieu va cao ((tuc va) OR (truc va)) ((hanh de) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu va cao ((tuc va) OR (truc va)) ((hanh de) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x hoi. hieu va cao ((tuc va) OR (truc va)) ((hanh de) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu va cao ((tuc va) OR (truc va)) ((hanh de) or (hanh vi)) cua tre*.