Perhaps you should try some spelling variations:
phuong dinh » phuong binh, phuong linh, phuong trinh
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
phuong dan » phuong danh, phuong doan, huong dan
trinh cua » trinh luat, trinh quan, trinh luan
tinh cua » sinh cua, tinh chat, tranh cua
toan tap » toan 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 xanh - hanh ((trinh cua) OR (tinh cua)) nhu ((phuong dan) or (phuong dinh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - hanh ((trinh cua) OR (tinh cua)) nhu ((phuong dan) OR (phuong dinh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - hanh ((trinh cua) OR (tinh cua)) nhu ((phuong dan) or (phuong dinh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - hanh ((trinh cua) OR (tinh cua)) nhu ((phuong dan) or (phuong dinh)) toan tap*.