Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky hang » ky nang, ly hang, ky dang
tai hoi » tai khoi, dai hoi, tai hai
dinh vi » dinh ve, dinh viet, dinh tri
luc va » tuc va, loc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky hang tai hoi. ((hieu van) or (hieu qua)) cam ((luc va) or (duc va)) dinh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky hang tai hoi. ((hieu van) OR (hieu qua)) cam ((luc va) OR (duc va)) dinh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: te sach ky hang tai hoi. ((hieu van) or (hieu qua)) cam ((luc va) or (duc va)) dinh vi cua vat*.