Perhaps you should try some spelling variations:
phuong tinh » phuong trinh, phuong binh, khuong tinh
theo chieu » theo tieu, ho chieu, theo chu
chieu sang » chieu sach, chieu xanh, hieu lang
cua hoang » quan hoang, tuan hoang, xuan hoang
cua hang » cua dang, cua nhung, cua cong
toan cao » toan 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 sang - canh tranh ((cua hoang) or (cua hang)) phuong tinh ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sang - canh tranh ((cua hoang) OR (cua hang)) phuong tinh ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sang - canh tranh ((cua hoang) or (cua hang)) phuong tinh ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: theo chieu sang - canh tranh ((cua hoang) or (cua hang)) phuong tinh ((toan cao) OR (toan ban))*.