Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
so sanh » do sanh
va hanh » van hanh, va danh, ban hanh
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
voi hoa » voi hoat, voi khoa, boi hoa
ve nam » he nam, va nam, le nam
sanh y » sinh y, anh y, hanh y
y nang » ky nang, ly nang, v nang
vi hoa » vi hoc, va hoa, bi hoa

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 cao hoi. hieu ve nam thuc ((va hanh) or (va thanh)) ((vi hoa) OR (voi hoa)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y nang cao hoi. hieu ve nam thuc ((va hanh) OR (va thanh)) ((vi hoa) OR (voi hoa)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y nang cao hoi. hieu ve nam thuc ((va hanh) or (va thanh)) ((vi hoa) OR (voi hoa)) viet".
• Adding a wildcard symbol may retrieve word variants: so sanh y nang cao hoi. hieu ve nam thuc ((va hanh) or (va thanh)) ((vi hoa) OR (voi hoa)) viet*.