Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong dan » phuong danh, phuong doan, huong dan
hieu sach » chieu sach, hieu cach, dien sach
trung vap » trung cap, trung va, trung lap
trung van » truong van, trong van, trung va
doc hieu » toc thieu, hoc thieu, hoc hien
dan toan » van toan, dan than, manh toan
toan cau » 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 hieu sach - thanh ((trung vap) OR (trung van)) nhung phuong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - thanh ((trung vap) OR (trung van)) nhung phuong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh ((trung vap) OR (trung van)) nhung phuong dan toan cau*.