Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong tinh » phuong trinh, phuong binh, khuong tinh
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
tran hang » tran hoang, tranh hang, tran thang
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 hieu lang - tran hang va nhung phuong tinh toan ban~.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - tran hang va nhung phuong tinh toan ban*.