Perhaps you should try some spelling variations:
trinh thiet » trinh thi
chieu sang » chieu sach, chieu xanh, hieu lang
trinh viet » ninh viet, trinh vat
cong manh » duong manh, cong thanh, hoang manh
cong danh » cuong danh, cong dan, cong thanh
ho chieu » theo chieu, hoc thieu, doi chieu
toan tap » toan ban

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 sang - hanh ((trinh thiet) or (trinh viet)) nhung ((cong manh) OR (cong danh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - hanh ((trinh thiet) OR (trinh viet)) nhung ((cong manh) OR (cong danh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - hanh ((trinh thiet) or (trinh viet)) nhung ((cong manh) OR (cong danh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - hanh ((trinh thiet) or (trinh viet)) nhung ((cong manh) OR (cong danh)) toan tap*.