Perhaps you should try some spelling variations:
thuyet luong » thuyet thong, theo luong, thuy duong
thuat luong » thuat tuong, thuat chuong, chat luong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
manh toan » thanh toan, anh tuan, tinh toan
van toan » van tuan, van tan, van thanh

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 - canh tranh ((thuat luong) OR (thuyet luong)) cong ((manh toan) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - canh tranh ((thuat luong) OR (thuyet luong)) cong ((manh toan) OR (van toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - canh tranh ((thuat luong) OR (thuyet luong)) cong ((manh toan) or (van toan)) cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - canh tranh ((thuat luong) OR (thuyet luong)) cong ((manh toan) or (van toan)) cao*.