Perhaps you should try some spelling variations:
thien hoat » trien hoat, thien thuat, tien hoa
quang tang » quang thang, quang dang, quang tung
hieu soat » hieu suat, hieu hoat, hieu luat
hien soat » kiem soat, bien soan, hien luat
tang van » dang van, hoang van, trong van
van hien » van hieu, van tien
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung luan van ((hieu soat) or (thien hoat)) ) or ( tinh quang tang van hien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van ((hieu soat) OR (thien hoat)) ) OR ( tinh quang tang van hien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van ((hieu soat) or (thien hoat)) ) or ( tinh quang tang van hien soat ))*.