Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh thuc
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
dan toan » van toan, dan than, manh toan

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

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