Perhaps you should try some spelling variations:
vat hanh » vat thanh, va hanh, nhat hanh
van hanh » van thanh, ban hanh, van anh
so sanh » do sanh
cao hoi » cau hoi, co hoi, cao hoc
sanh y » sinh y, anh y, hanh y
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
vi hoa » voi hoa, vi hoc, va 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 cam) OR (ve cac)) thuc ((vat hanh) or (van hanh)) vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y nang cao hoi. hieu ((ve cam) OR (ve cac)) thuc ((vat hanh) OR (van hanh)) vi hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y nang cao hoi. hieu ((ve cam) OR (ve cac)) thuc ((vat hanh) or (van hanh)) vi hoa viet".
• Adding a wildcard symbol may retrieve word variants: so sanh y nang cao hoi. hieu ((ve cam) OR (ve cac)) thuc ((vat hanh) or (van hanh)) vi hoa viet*.