Perhaps you should try some spelling variations:
dang quang » dung quang, nang quan, dang hung
tinh luong » tinh huong, dinh luong, minh luong
luong luan » luong quan, luong xuan, cuong luan
tinh dang » tinh dung, binh dang, tinh sang
quang uan » quang tuan, quang ban, quang tran
hieu soat » hieu suat, hieu hoat, hieu so
hieu luat » hieu qua
kiem soat » kiem toan
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 dang quang uan ((hieu soat) or (hieu luat)) ) or ( tinh luong luan van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dang quang uan ((hieu soat) OR (hieu luat)) ) OR ( tinh luong luan van kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dang quang uan ((hieu soat) or (hieu luat)) ) or ( tinh luong luan van kiem soat ))*.