Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dan hang » ban hang, van hang, dat hang
thuc dan » thuc hanh, hoc dan, thuc vat
lam thuc » lam thuoc, am thuc, nam thuc
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
hang de » hoang de, hanh de, hang di
van lam » van nam
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: ((thu sach) or (su sach)) ky nang ma hoi. hieu van lam thuc dan hang de ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang ma hoi. hieu van lam thuc dan hang de ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang ma hoi. hieu van lam thuc dan hang de ((cua triet) or (su triet))*.