Perhaps you should try some spelling variations:
hanh tranh » hanh trinh, hanh trang, lanh tranh
hoc thieu » toc thieu, hoc hien
doc hieu » toc thieu, hoc hien
ban cong » bang cong, van cong, phan cong
cong san » cong tac
san than » sang than, san thanh, ban than
than ban » thanh ban, toan ban, than man

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (doc hieu)) xanh - ((hanh tranh) OR (canh tranh)) cua ban cong san than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (doc hieu)) xanh - ((hanh tranh) OR (canh tranh)) cua ban cong san than ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (doc hieu)) xanh - ((hanh tranh) OR (canh tranh)) cua ban cong san than ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (doc hieu)) xanh - ((hanh tranh) OR (canh tranh)) cua ban cong san than ban*.