Perhaps you should try some spelling variations:
dung phuong » bang phuong, dung chung, hoang phuong
dung thuong » dung trong, hang thuong, cong thuong
thanh tung » thanh cong
hieu cach » hieu cac, chieu sach, hieu ca
tung tuan » trung tuan, hung tuan, quang tuan
manh toan » thanh toan, anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu cach - thanh tung tuan ((dung phuong) OR (dung thuong)) ((xuan toan) or (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - thanh tung tuan ((dung phuong) OR (dung thuong)) ((xuan toan) OR (manh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cach - thanh tung tuan ((dung phuong) OR (dung thuong)) ((xuan toan) or (manh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - thanh tung tuan ((dung phuong) OR (dung thuong)) ((xuan toan) or (manh toan)) cao*.