Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
lam truoc » lam thuoc, nam truoc, lam truong
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
truoc va » truc va, thuoc va, truong va
hieu va » lieu va
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
me hoi » le hoi

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 y nang ((me hoi) or (mai hoi)). ((hieu va) OR (hieu qua)) lam truoc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((me hoi) OR (mai hoi)). ((hieu va) OR (hieu qua)) lam truoc va thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((me hoi) or (mai hoi)). ((hieu va) OR (hieu qua)) lam truoc va thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((me hoi) or (mai hoi)). ((hieu va) OR (hieu qua)) lam truoc va thanh dai cua tre*.