Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hien sang » hien trang, khien bang, chieu sang
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
van toan » van tuan, van tan, van thanh
van quan » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sang - hanh trinh vat nhung cong ((van toan) or (van quan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sang - hanh trinh vat nhung cong ((van toan) OR (van quan)) cao*.