Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
cao hoi » cau hoi, co hoi, cao hoc
xuc cac » xuc tac, tuc cac, xuc cam
cac ban » cac dan, cac van, can ban
ve cac » va cac
va cua » va chua, via cua, ca cua
cua tu » cua tuc, cua su, cua cu

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 ky nang cao hoi. hieu ((ve cac) or (vien cac)) xuc cac ban va cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky nang cao hoi. hieu ((ve cac) OR (vien cac)) xuc cac ban va cua tu.
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang cao hoi. hieu ((ve cac) or (vien cac)) xuc cac ban va cua tu*.