Perhaps you should try some spelling variations:
nang dau » hang dau, xang dau, nang du
ban hang » ngan hang
luy tre » luyen tre
luc ban » duc ban, cuc ban, luc bat
luu tre » luu tru, cuu tre
hang vi » hang va, hanh vi, hang di
cam luc » cam xuc, cau luc
dau hoi » cau hoi, dai hoi, dan hoi
hieu va » hieu qua
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang dau hoi. ((hieu va) or (lieu va)) cam luc ban hang vi ((luu tre) or (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang dau hoi. ((hieu va) OR (lieu va)) cam luc ban hang vi ((luu tre) OR (luy tre)).
• Adding a wildcard symbol may retrieve word variants: te sac ky nang dau hoi. ((hieu va) or (lieu va)) cam luc ban hang vi ((luu tre) or (luy tre))*.