Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
phuong dan » phuong danh, phuong doan, huong dan
tranh va » tranh van, trang va, trinh va
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: hoc ((chieu sang) or (chiet tach)) - canh tranh va nhung phuong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chiet tach)) - canh tranh va nhung phuong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chiet tach)) - canh tranh va nhung phuong dan toan ban*.