Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet chan » thien chanh, thuat chan, thiet hai
doan thien » hoan thien, doan thi, toan thiet
kiem soat » kiem toan
dung lam » dung luan, dung tai, dung dat
van kiem » va kiem, van kien, van hieu
thien so » thieu so, thien su, khien so
lam van » lam san, nam van, dam 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 lam van kiem soat ) or ( trinh thiet chan doan thien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung lam van kiem soat ) OR ( trinh thiet chan doan thien so )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung lam van kiem soat ) or ( trinh thiet chan doan thien so ))*.