Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trang » canh tranh, hanh trinh, minh trang
khong cong » thong cong, khong cang, chong cong
hoc chieu » hoc thieu, ho chieu, hoc dieu
cua khong » hua khong, cua phuong, cua thuong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chieu) or (hoc hien)) xanh - ((hanh trang) OR (thanh trung)) cua khong cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc hien)) xanh - ((hanh trang) OR (thanh trung)) cua khong cong tan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (hoc hien)) xanh - ((hanh trang) OR (thanh trung)) cua khong cong tan van ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc hien)) xanh - ((hanh trang) OR (thanh trung)) cua khong cong tan van ban*.