Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh hoi » hanh thoi, hanh noi, hanh hoa
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
lam xuc » cam xuc, lam duoc
hoi cua » hoi chuc
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
tang ma » mang may, tang van
van lam » van nam
xuc va » duc va, tuc va, luc va
cua su » qua su

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) or (toc sach)) tu ((nang xa) or (tang ma)) hoi. hieu van lam xuc va hanh hoi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) tu ((nang xa) OR (tang ma)) hoi. hieu van lam xuc va hanh hoi cua su.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) tu ((nang xa) or (tang ma)) hoi. hieu van lam xuc va hanh hoi cua su*.