Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
luan dung » lan dung, luan dong, luan ung
luan hung » luan chung, lan hung, luan ung
doc hieu » toc thieu, hoc hien
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan 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) or (hoc thieu)) manh - hanh trinh ((luan dung) or (luan hung)) cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) manh - hanh trinh ((luan dung) OR (luan hung)) cong tac toan tap.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc thieu)) manh - hanh trinh ((luan dung) or (luan hung)) cong tac toan tap*.