Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, chien tranh
hanh trinh » hanh chinh
hien hanh » dieu hanh
trong san » trong cac, cong san, dong san
qua dung » quang dung, su dung, qua song
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 ((thien thanh) OR (hien hanh)) - ((canh tranh) or (hanh trinh)) qua dung trong san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (hien hanh)) - ((canh tranh) OR (hanh trinh)) qua dung trong san toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien thanh) OR (hien hanh)) - ((canh tranh) or (hanh trinh)) qua dung trong san toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) OR (hien hanh)) - ((canh tranh) or (hanh trinh)) qua dung trong san toan tap*.