Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
va hang » van hang, va nang, va lang
thuc va » thuc vat, thuc dan, thuc day
tu cach » tu cac
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
van cau » van dau, van hau, van chat
ma hoi » mai hoi, xa hoi, ma hoa
te cua » le cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) ky nang ma hoi. hieu van cau thuc va hang ((te cua) or (tue cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang ma hoi. hieu van cau thuc va hang ((te cua) OR (tue cua)) triet.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang ma hoi. hieu van cau thuc va hang ((te cua) or (tue cua)) triet*.