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