Perhaps you should try some spelling variations:
sau chan » cau chan, mau chan, san chang
thanh vi » hanh vi, thanh va, thanh ve
hieu sau » hieu su, hieu suat, tieu su
ky sang » ky nang, ky dang, ky tang
vi cua » vai cua, di cua
xu van » tu van, vu van, su van
tu sac » tu sach, tu cac, tu san
ma hoi » mai hoi, ma hoa, me hoi
sac ky » cac ky, sai ky
cua te » cua tu
xu va » tu va, su va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky sang ((ma hoi) or (xa hoi)). hieu sau chan ((xu va) OR (xu van)) thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ((ma hoi) OR (xa hoi)). hieu sau chan ((xu va) OR (xu van)) thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang ((ma hoi) or (xa hoi)). hieu sau chan ((xu va) OR (xu van)) thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ((ma hoi) or (xa hoi)). hieu sau chan ((xu va) OR (xu van)) thanh vi cua te*.