Perhaps you should try some spelling variations:
gian cua » ban cua
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
ma hoi » xa hoi, ma hoa, me hoi
bai bo » bac bo, ban bo, bai mo
bo va » bao va, do va, so va

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 ((ma hoi) or (mai hoi)). hieu va bai bo va hanh ((gian cua) OR (gian xu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky nang ((ma hoi) OR (mai hoi)). hieu va bai bo va hanh ((gian cua) OR (gian xu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky nang ((ma hoi) or (mai hoi)). hieu va bai bo va hanh ((gian cua) OR (gian xu)) tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang ((ma hoi) or (mai hoi)). hieu va bai bo va hanh ((gian cua) OR (gian xu)) tre*.