Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong danh » phuong anh, phuong dinh, phuong hanh
phuong dan » phuong doan, huong dan, phuong lan
hieu cach » hieu cac, chieu sach, hieu ca
doc hieu » toc thieu, hoc thieu, hoc hien
va doanh » van doanh, vay doanh, va danh
toan cao » toan ban, toan tap
va doan » van doan, va dan, va don

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 cach - thanh trung ((va doan) OR (va doanh)) ((phuong dan) or (phuong danh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu cach - thanh trung ((va doan) OR (va doanh)) ((phuong dan) OR (phuong danh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu cach - thanh trung ((va doan) OR (va doanh)) ((phuong dan) or (phuong danh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu cach - thanh trung ((va doan) OR (va doanh)) ((phuong dan) or (phuong danh)) toan cao*.