Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
so sanh » do sanh
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
vi ca » vit ca, li ca, vi ha
va ca » va cac, va cao, va cai

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) or (cho sinh)) y nang ma hoi. hieu van cham truc va hanh ((vi ca) OR (va ca)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (cho sinh)) y nang ma hoi. hieu van cham truc va hanh ((vi ca) OR (va ca)) viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sanh) or (cho sinh)) y nang ma hoi. hieu van cham truc va hanh ((vi ca) OR (va ca)) viet*".