Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
hoc thieu » toc thieu, hoc hien
cua trong » cua truong, cua trung, qua trong
doc hieu » toc thieu, hoc hien
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan tap » toan ban

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