Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh huong
hieu luat » hieu qua
kiem soat » kiem toan
dung sai » dung tai, dung va, dung dat
tran van » luan van
co hieu » cao hieu, doc hieu
toan va » doan va, toan ban, toan tap
sai co » mai co, tai co, soi co

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 sai co hieu luat ) or ( tinh quang ((toan va) OR (tran van)) kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung sai co hieu luat ) OR ( tinh quang ((toan va) OR (tran van)) kiem soat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung sai co hieu luat ) or ( tinh quang ((toan va) OR (tran van)) kiem soat ))*".