Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
tham thuc » nham thuc, pham thuc, tam thuc
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu 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
vit ca » viet ca, viet cau
vi ca » li ca, va ca, vi ha

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 tham thuc vat thanh ((vi ca) OR (vit 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 tham thuc vat thanh ((vi ca) OR (vit 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 tham thuc vat thanh ((vi ca) OR (vit ca)) viet".
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (cho sinh)) y nang ma hoi. hieu van tham thuc vat thanh ((vi ca) OR (vit ca)) viet*.