Perhaps you should try some spelling variations:
tinh tinh » trinh tinh, tinh ninh, tinh binh
quang dan » quang dang, quang doan, quang ban
kiem soat » kiem toan
nang dung » dang dung, nang dong, rang dung
hieu suat » hieu luat, hieu qua
dan kiem » van kiem, toan kiem, phan kiem
tin nang » tin dung, ki nang, thi nang
dung van » duong van, dung va, dang van
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: (( tinh tinh quang dan kiem soat ) or ( tin nang dung van hieu suat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh tinh quang dan kiem soat ) OR ( tin nang dung van hieu suat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh tinh quang dan kiem soat ) or ( tin nang dung van hieu suat ))*.