Perhaps you should try some spelling variations:
trinh xuat » trinh luat, trinh xuan, trich xuat
hieu tinh » chieu tinh, lieu tinh, kieu tinh
dung cong » dung trong
tran chau » tranh chap, tran huu
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san tran » tan tran, ban tran, dang tran

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tinh - hanh ((trinh xuat) or (tinh chat)) dung cong san tran chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - hanh ((trinh xuat) OR (tinh chat)) dung cong san tran chau.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - hanh ((trinh xuat) or (tinh chat)) dung cong san tran chau*.