Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lam thuc » lam thuoc, am thuc, nam thuc
van hang » van khang, van hoang, van thang
thuc van » thuc vat, thuc dan, thuc va
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, te sach, tu cach
hang de » hoang de, hanh de, hang di
van lam » van nam
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
su viet » so viet
ma hoi » mai hoi, xa hoi, ma hoa

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 (su sach)) ky nang ma hoi. hieu van lam thuc van hang de ((cua triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ma hoi. hieu van lam thuc van hang de ((cua triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ma hoi. hieu van lam thuc van hang de ((cua triet) or (su viet))*.