Perhaps you should try some spelling variations:
dung duong » dung dong, dong duong, dung dung
hanh tranh » canh tranh, hanh trinh, hanh trang
duong manh » duong van
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » hoc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
toan ban » van ban
va dung » van dung, va duong, vat dung

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 (toc thieu))) or (theo tieu)) xanh - hanh tranh va dung duong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((doc hieu) OR (toc thieu))) OR (theo tieu)) xanh - hanh tranh va dung duong manh toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((doc hieu) OR (toc thieu))) or (theo tieu)) xanh - hanh tranh va dung duong manh toan ban*".