Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang cong » dang cong, hang nong, bang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
va hang » van hang, va nang, va lang
chon tu » con tu, cho tu, choi tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - canh trinh va hang cong san ((chon tu) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh trinh va hang cong san ((chon tu) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh trinh va hang cong san ((chon tu) or (phan tu))*.