Perhaps you should try some spelling variations:
nhung tuong » nhung huong, nhung phuong, hung vuong
khien bang » phien ban, khien dong
luan nhung » luan chung, luan hung, quan nhung
hien sang » hien trang, chieu sang, thien bang
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
van thanh » ban thanh, van tuan
van toan » van tuan, van tan, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sang) OR (khien bang)) - hanh tang luan nhung tuong ((van toan) or (van thanh)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sang) OR (khien bang)) - hanh tang luan nhung tuong ((van toan) OR (van thanh)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sang) OR (khien bang)) - hanh tang luan nhung tuong ((van toan) or (van thanh)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) OR (khien bang)) - hanh tang luan nhung tuong ((van toan) or (van thanh)) cao*.