Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
danh dau » lanh dao, hang dau, danh tu
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
cu tren » tu tren, dua tren
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
luc va » tuc va, loc va
dau cu » dau cua, dau tu, dau co

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky tang xa hoi. hieu qua cham ((luc va) or (duc va)) danh dau cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky tang xa hoi. hieu qua cham ((luc va) OR (duc va)) danh dau cu tren.
• Adding a wildcard symbol may retrieve word variants: vu sac ky tang xa hoi. hieu qua cham ((luc va) or (duc va)) danh dau cu tren*.