Perhaps you should try some spelling variations:
tien manh » tien anh, tien thanh, tieng anh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan han » luan hoan, luan phan, luan van
tong tac » tuong tac, trong tac, cong tac
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((tien manh) or (dieu hanh)) - hanh tang luan han tong tac ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tien manh) OR (dieu hanh)) - hanh tang luan han tong tac ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tien manh) or (dieu hanh)) - hanh tang luan han tong tac ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: theo ((tien manh) or (dieu hanh)) - hanh tang luan han tong tac ((toan cao) OR (toan ban))*.