Perhaps you should try some spelling variations:
phuong cong » phuong dong, phung cong, phuong hoang
phong cong » phong chong, thong cong, chong cong
hach toan » thanh toan, manh toan
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
anh tang » anh bang, anh dang, anh nang
tac toan » tap toan, tam toan, tich toan
tang ma » mang may, tang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu sach - anh tang ma ((phuong cong) or (phong cong)) ((tac toan) or (hach toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - anh tang ma ((phuong cong) OR (phong cong)) ((tac toan) OR (hach toan)) cau.
• Adding a wildcard symbol may retrieve word variants: theo chu sach - anh tang ma ((phuong cong) or (phong cong)) ((tac toan) or (hach toan)) cau*.