Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong dan » phuong danh, phuong doan, huong dan
dien sach » dien anh
trung cao » truong cao, trung cap, trung ca
doc dien » duoc dien, doi dien, do dien
trung co » trung bo, trong co, truong cao
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc dien sach - thanh ((trung cao) or (trung co)) nhung phuong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc dien sach - thanh ((trung cao) OR (trung co)) nhung phuong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: doc dien sach - thanh ((trung cao) or (trung co)) nhung phuong dan toan cao*.