Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh chat » tinh chat, trinh luat, trinh han
chat trong » nhat trong, thuat trong, chat luong
dung thang » hung thang, cung thang, dung thuong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
phan lap » phan dau

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 tinh - hanh trinh chat trong ((dung thang) or (cong tan)) phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - hanh trinh chat trong ((dung thang) OR (cong tan)) phan lap.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - hanh trinh chat trong ((dung thang) or (cong tan)) phan lap*.