Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong dan » phuong danh, phuong doan, huong dan
hieu cach » hieu cac, chieu sach, hieu ca
hoc hieu » hoc thieu, hoc hien, doc hieu
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu cach - hanh ((tran van) or (luan van)) nhung phuong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - hanh ((tran van) OR (luan van)) nhung phuong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - hanh ((tran van) or (luan van)) nhung phuong dan toan cao*.