Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
cham duc » pham duc, cham soc, pham duy
ban hang » ngan hang
hieu tu » chieu tu, hieu tuc, lieu tu
hien tu » khien tu, dien tu
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
may va » may vi, day va
thiet » thieu

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 nang cau hoi. ((hieu tu) or (hien tu)) cham duc ((ban hanh) or (ban hang)) may va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang cau hoi. ((hieu tu) OR (hien tu)) cham duc ((ban hanh) OR (ban hang)) may va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang cau hoi. ((hieu tu) or (hien tu)) cham duc ((ban hanh) or (ban hang)) may va thiet*.