Perhaps you should try some spelling variations:
phan thanh » pham thanh, ban thanh, van thanh
hieu soat » hieu suat, hieu hoat, hieu luat
viec dat » vien dai, vien da, viec lam
thanh ho » thanh pho, thanh hoa, thanh hoc
van hieu » cao hieu
luan va » luan van, luat va
va viec » va viet, ve viec, lam viec
ho van » hoc van, vo van, so van
tin » tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung luan va viec dat ) or ( phan thanh ho van hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan va viec dat ) OR ( phan thanh ho van hieu soat ))*.