Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
van cam » van nam, van lam, van cau
so sanh » do sanh
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sanh y » sinh y, anh y, hanh y
tuc va » thuc va, truc va, duc va
vi cua » di cua
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh y nang ma hoi. hieu van cam ((tuc va) or (tuc xa)) hanh ((vi cua) or (vai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y nang ma hoi. hieu van cam ((tuc va) OR (tuc xa)) hanh ((vi cua) OR (vai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: so sanh y nang ma hoi. hieu van cam ((tuc va) or (tuc xa)) hanh ((vi cua) or (vai cua)) viet*.