Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hien xanh » hien hanh, chieu xanh, hien khanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
chat hang » chat quang, chat chong, chat phong
hang cong » dang cong, hang nong, bang cong
van toan » van tuan, van tan, van thanh

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 xanh) or (hien nhanh)) - hanh tinh chat hang cong ((van toan) or (van ban)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - hanh tinh chat hang cong ((van toan) OR (van ban)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - hanh tinh chat hang cong ((van toan) or (van ban)) ban*.