Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh toan » tinh toan, thanh toan, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
toan hang » toan thang, toan hanh, toan mang
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tran ban » tranh ban, tran van, tran bai
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - hanh trinh toan hang cong tan ((tran ban) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - hanh trinh toan hang cong tan ((tran ban) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh trinh toan hang cong tan ((tran ban) or (toan ban))*.