Perhaps you should try some spelling variations:
thanh trung » thanh tung
thuat nhung » thuat hung, thuat chung, thuat chuong
hieu quang » thieu quang, hieu quan, hieu qua
tran trong » gian trong, quan trong, tran hong
thanh lap » phan lap, thanh hai, thanh van
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu quang - thanh trung ((thuat nhung) or (tran trong)) cong san ((thanh lap) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu quang - thanh trung ((thuat nhung) OR (tran trong)) cong san ((thanh lap) OR (thanh san)).
• Adding a wildcard symbol may retrieve word variants: doc hieu quang - thanh trung ((thuat nhung) or (tran trong)) cong san ((thanh lap) or (thanh san))*.