Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu tinh » chieu tinh, lieu tinh, kieu tinh
ban thanh » ban hanh, ban hang
doc hieu » toc thieu, hoc thieu, hoc hien
cua phan » cua nhan, cua phap, cua han
cua ngan » cua ban, vu ngan, cua dan
dan toan » van toan, dan than, manh toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - hanh trinh ((cua phan) OR (cua ngan)) cong ((dan toan) OR (ban thanh)) cau~.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - hanh trinh ((cua phan) or (cua ngan)) cong ((dan toan) or (ban thanh)) cau*.