Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
sach thue » sach thieu, sach tham, cach thuc
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh loi
sach thu » sach thieu, sach tham, cach thuc
nam duc » nam duoc, pham duc, nam thuc
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thu) or (sach thue)) nang xa hoi. hieu van nam duc va ((hanh lai) or (thanh lap)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thue)) nang xa hoi. hieu van nam duc va ((hanh lai) OR (thanh lap)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach thue)) nang xa hoi. hieu van nam duc va ((hanh lai) or (thanh lap)) cua tre*.