Perhaps you should try some spelling variations:
trien hoat » tien hoa
trinh san » trinh han, trinh quan, trinh toan
san quang » van quang, dan quang, san quan
quang van » quang ban, quan van, quang uan
van trien » van tien, va trien, van tren
tinh dung » trinh dung, tin dung, tinh huong
hieu luat » hieu qua
van hieu » cao hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh san quang van trien hoat ) or ( ((tinh dung) or (tinh quang)) luan van hieu luat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh san quang van trien hoat ) OR ( ((tinh dung) OR (tinh quang)) luan van hieu luat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh san quang van trien hoat ) or ( ((tinh dung) or (tinh quang)) luan van hieu luat ))*.