Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh lai » hanh lam, hanh tai, thanh lap
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, sach tham
nang xa » nang x, lang xa, nang ma
van dau » van dao, phan dau
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
lai cua » dai cua, hai cua, lai chau

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 y) or (sach thu)) nang xa hoi. hieu van dau ((truc va) or (thuc va)) hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sach thu)) nang xa hoi. hieu van dau ((truc va) OR (thuc va)) hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach thu)) nang xa hoi. hieu van dau ((truc va) or (thuc va)) hanh lai cua viet*.