Perhaps you should try some spelling variations:
phuong dung » thong dung, cuong dung, phuong hoang
phuong dong » phuong hoang, chuong duong, phuong dinh
theo chieu » theo tieu, ho chieu, theo chu
hanh tranh » canh tranh, hanh trinh, hanh trang
doc hieu » toc thieu, hoc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
tac toan » tap toan, tam toan, hach toan
toan ban » van 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 (theo chieu)) xanh - hanh tranh va ((phuong dong) OR (phuong dung)) tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo chieu)) xanh - hanh tranh va ((phuong dong) OR (phuong dung)) tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (theo chieu)) xanh - hanh tranh va ((phuong dong) OR (phuong dung)) tac toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo chieu)) xanh - hanh tranh va ((phuong dong) OR (phuong dung)) tac toan ban*.