Perhaps you should try some spelling variations:
tinh huong » dinh huong, anh huong
quang tang » quang thang, quang dang, quang tung
huong luan » huong lan, cuong luan, huong loan
kiem soat » kiem toan
hieu soan » hieu toan, hieu van, bien soan
hieu suat » hieu luat, hieu qua
tang van » dang van, hoang van, trong van
van kiem » va kiem, van kien, van hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh quang tang van kiem soat ) or ( tinh huong luan van ((hieu soan) OR (hieu suat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang tang van kiem soat ) OR ( tinh huong luan van ((hieu soan) OR (hieu suat)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh quang tang van kiem soat ) or ( tinh huong luan van ((hieu soan) OR (hieu suat)) ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh quang tang van kiem soat ) or ( tinh huong luan van ((hieu soan) OR (hieu suat)) ))*.