Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu quan » hieu qua, lieu quan, thien quan
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dung » cua dang, cua dong, qua dung
san toan » dan toan, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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 quan - hanh trinh cua dung cong ((san toan) or (van toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quan - hanh trinh cua dung cong ((san toan) OR (van toan)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc hieu quan - hanh trinh cua dung cong ((san toan) or (van toan)) tap*.