Perhaps you should try some spelling variations:
trung phuong » truong phuong, rung phuong, thuong phuong
phuong dan » phuong danh, phuong doan, huong dan
tieu sach » chieu sach, dien sach, te sach
tang luan » dung luan
tang cua » mang cua, hang cua, thong cua
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: theo tieu sach - hanh ((tang cua) OR (tang luan)) trung phuong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - hanh ((tang cua) OR (tang luan)) trung phuong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh ((tang cua) OR (tang luan)) trung phuong dan toan cao*.