Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
theo chieu » theo tieu, ho chieu, theo chu
hoa khong » khoi khong, hoa cong, hoa dong
dan thanh » dang thanh, danh thanh, ban thanh
thanh cat » thanh dat, hanh cat, thanh ca
doc hieu » toc thieu, hoc thieu, hoc hien
he khong » he thong

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