Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
chiet tach » chieu sach
phuong dan » phuong danh, phuong doan, huong dan
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh cua » trinh cua, sinh cua, tinh chat
cua dung » cua dang, cua dong, qua dung
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((nhiet tach) OR (chiet tach)) - hanh tinh cua dung phuong dan van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((nhiet tach) OR (chiet tach)) - hanh tinh cua dung phuong dan van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((nhiet tach) OR (chiet tach)) - hanh tinh cua dung phuong dan van ban*.