Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh vai » hanh vi, hanh va, hanh tai
mai hoi » mai khoi, dai hoi, lai hoi
vai cau » va cau, van cau, vai cac
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
san ky » sang ky, van ky, dan ky
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
ma hoi » xa hoi, ma hoa, me hoi
tu san » thu san, tu ban, tu can

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky sang ((ma hoi) OR (mai hoi)). hieu ve cam ((xuc va) or (tuc xa)) hanh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky sang ((ma hoi) OR (mai hoi)). hieu ve cam ((xuc va) OR (tuc xa)) hanh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky sang ((ma hoi) OR (mai hoi)). hieu ve cam ((xuc va) or (tuc xa)) hanh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: tu san ky sang ((ma hoi) OR (mai hoi)). hieu ve cam ((xuc va) or (tuc xa)) hanh vai cau tren*.