Perhaps you should try some spelling variations:
trinh thanh » tinh thanh, trinh han, trinh toan
chiet tach » chieu sach
trinh hanh » trinh han, trinh hinh, trinh kinh
nhung cong » dung cong, thong cong, hang cong
trinh anh » trinh kinh, trinh dinh, trinh sinh
ho chiet » ho chieu, ho thiet, hoc thiet
cong dan » cong san, cong tan, huong dan
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 chiet tach - hanh ((trinh hanh) or (((trinh anh) OR (trinh thanh)))) nhung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh ((trinh hanh) OR (((trinh anh) OR (trinh thanh)))) nhung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - hanh ((trinh hanh) or (((trinh anh) OR (trinh thanh)))) nhung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh ((trinh hanh) or (((trinh anh) OR (trinh thanh)))) nhung cong dan toan cau*.