Perhaps you should try some spelling variations:
tinh thong » tinh thuong, trinh thong, tinh khong
tinh dung » trinh dung, tin dung, tinh quang
quang van » quang ban, quang uan, quang vinh
hieu luat » hieu qua
kien soat » kiem soat, bien soan, kien hoa
quang va » quan va, quang ma, quang nam
quan van » luan van, quan va, quan luan
van kien » van tien, van hien, van chien

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

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