Perhaps you should try some spelling variations:
khung luong » hung luong, khung long, thuong luong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
luong manh » duong manh, luong thanh, duong minh
dai khung » dai khong, dam khung, dai khoang
manh toan » thanh toan, anh tuan, tinh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - ((thanh trung) or (thanh tung)) dai khung luong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((thanh trung) OR (thanh tung)) dai khung luong manh toan ban.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((thanh trung) or (thanh tung)) dai khung luong manh toan ban*.