Perhaps you should try some spelling variations:
khong huong » khong xuong, thong huong, thong thuong
hanh tranh » canh tranh, hanh trang, lanh tranh
theo chieu » theo tieu, ho chieu, theo chu
hanh trinh » canh tranh, hanh chinh
dan thanh » dang thanh, danh thanh, ban thanh
thanh bai » thanh hai, thanh tai, thanh oai
doc hieu » toc thieu, hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (doc hieu)) xanh - ((hanh tranh) OR (hanh trinh)) khoi khong huong dan thanh bai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doc hieu)) xanh - ((hanh tranh) OR (hanh trinh)) khoi khong huong dan thanh bai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doc hieu)) xanh - ((hanh tranh) OR (hanh trinh)) khoi khong huong dan thanh bai".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doc hieu)) xanh - ((hanh tranh) OR (hanh trinh)) khoi khong huong dan thanh bai*.