Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, canh tinh
dong cong » duong cong, dung cong, cong cong
dang cong » dung cong
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (trieu tinh)) - canh trinh chuan ((dong cong) OR (dang cong)) dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (trieu tinh)) - canh trinh chuan ((dong cong) OR (dang cong)) dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (trieu tinh)) - canh trinh chuan ((dong cong) OR (dang cong)) dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (trieu tinh)) - canh trinh chuan ((dong cong) OR (dang cong)) dan toan cau*.