Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
bang cong » bang song, hang cong, dung cong
dang cong » dung cong
tan toan » tan tran, tap toan, dan 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 - hanh trinh chuan ((bang cong) or (dang cong)) ((tan toan) OR (van toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh trinh chuan ((bang cong) OR (dang cong)) ((tan toan) OR (van toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh trinh chuan ((bang cong) or (dang cong)) ((tan toan) OR (van toan)) tap".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh trinh chuan ((bang cong) or (dang cong)) ((tan toan) OR (van toan)) tap*.