Perhaps you should try some spelling variations:
phuong dong » phuong dung, phuong hoang, chuong duong
hanh tranh » canh tranh, hanh trinh, hanh trang
theo chieu » theo tieu, thi chieu
cua phuong » cuu phuong, cuc phuong, luan phuong
tranh cua » doanh cua, manh cua
ho chieu » hoc thieu, doi chieu, mot chieu
theo chu » cho chu, chao chu, theo yeu
dong bai » dong tai, dong bac, dong ban
bai toan » bai tap
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: ((((theo chieu) OR (ho chieu))) or (theo chu)) xanh - hanh tranh cua phuong dong bai toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((theo chieu) OR (ho chieu))) OR (theo chu)) xanh - hanh tranh cua phuong dong bai toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((theo chieu) OR (ho chieu))) or (theo chu)) xanh - hanh tranh cua phuong dong bai toan ban".
• Adding a wildcard symbol may retrieve word variants: ((((theo chieu) OR (ho chieu))) or (theo chu)) xanh - hanh tranh cua phuong dong bai toan ban*.