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