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
ve cac » va cac
dan va » doan va, ban va, han va
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 ((dan va) or (dan ca)) 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 ((dan va) OR (dan ca)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky nang cao hoi. hieu ((ve cac) OR (vien cac)) xuc cac ((dan va) or (dan ca)) cua tu".
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang cao hoi. hieu ((ve cac) OR (vien cac)) xuc cac ((dan va) or (dan ca)) cua tu*.