Perhaps you should try some spelling variations:
thuong dong » phuong dong, tuong dong, chuong dong
hieu lang » chieu sang, hieu quang, nhieu tang
tran van » luan van
dong tan » duong tan, dong tai, dong san
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh ((tran van) or ((luan OR lan) van)) thuong dong tan ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh ((tran van) OR ((luan OR lan) van)) thuong dong tan ((toan tai) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh ((tran van) or ((luan OR lan) van)) thuong dong tan ((toan tai) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh ((tran van) or ((luan OR lan) van)) thuong dong tan ((toan tai) or (toan ban))*.