Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
thieu sach » chieu sach, thien hach, hieu cach
phuong dan » phuong danh, phuong doan, huong dan
hoc thieu » toc thieu, hoc hien
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 thieu sach - hanh ((tran van) OR (luan van)) nhung phuong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((tran van) OR (luan van)) nhung phuong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((tran van) OR (luan van)) nhung phuong dan toan cao*.