Perhaps you should try some spelling variations:
hanh trinh » canh tranh
hien xanh » hien hanh, hien nhanh, chieu xanh
bang cong » dang cong, bang song, hang cong
cong san » cong tac
va bang » va nang, va lang, va ban
san tan » van tan, san van, san tay
tan cau » toan cau, van cau, tan ca

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 - ((hanh trinh) or (hanh chinh)) va bang cong san tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((hanh trinh) OR (hanh chinh)) va bang cong san tan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh trinh) or (hanh chinh)) va bang cong san tan cau*.