Perhaps you should try some spelling variations:
kiem soat » kiem toan
tinh quan » tinh quang, trinh quan, tin quan
hieu soat » hieu suat, hieu hoat, hieu luat
quan lan » quan luan, quan lang, quan van
luan va » luan van, luat va
va kiem » van kien
lan cao » lang cao, lan cho, nang cao

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 kiem soat ) or ( tinh quan lan cao hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan va kiem soat ) OR ( tinh quan lan cao hieu soat ))*.