Perhaps you should try some spelling variations:
sach thu » sach thue, sach tham, cach thuc
hanh via » hanh vi, hanh va, anh va
hieu van » hieu va, thien van, lieu va
via cua » gia cua, gian cua, giau cua
thuc va » thuc vat, thuc dan, thuc day
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
tuc va » truc va, tuc xa, duc va

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 thu) or (sach thieu)) lang xa hoi. hieu van cam ((tuc va) or (thuc va)) hanh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach thu) OR (sach thieu)) lang xa hoi. hieu van cam ((tuc va) OR (thuc va)) hanh via cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach thu) or (sach thieu)) lang xa hoi. hieu van cam ((tuc va) or (thuc va)) hanh via cua tre*.