Perhaps you should try some spelling variations:
tinh thong » tinh thuong, trinh thong, tinh khong
chien soat » thien hoat
van chien » van hien, van hieu, van tien
hieu soat » hieu hoat, hieu luat, kiem soat
hieu suat » hieu luat, hieu qua
dung lan » dung luan, dung land, dung lam
quan van » luan van, quan va, quan luan
lan van » luan van, lang van, tan van

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 lan van chien soat ) or ( tinh thong quan van ((hieu soat) OR (hieu suat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung lan van chien soat ) OR ( tinh thong quan van ((hieu soat) OR (hieu suat)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung lan van chien soat ) or ( tinh thong quan van ((hieu soat) OR (hieu suat)) ))".
• Adding a wildcard symbol may retrieve word variants: (( tin dung lan van chien soat ) or ( tinh thong quan van ((hieu soat) OR (hieu suat)) ))*.