Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong dan » phuong danh, phuong doan, huong dan
hieu sang » chieu sang, hieu lang, hieu quang
trinh cua » tinh cua, trinh quan, trinh luan
doc hieu » toc thieu, hoc thieu, hoc hien
dan toan » van toan, dan than, manh 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 sang - hanh ((trinh cua) or (trinh luat)) nhung phuong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - hanh ((trinh cua) OR (trinh luat)) nhung phuong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - hanh ((trinh cua) or (trinh luat)) nhung phuong dan toan ban*.