Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trinh viet » ninh viet, trinh vat
nhung cong » dung cong, thong cong, hang cong
trinh ven » trinh van, trinh ve, trinh den
trinh vi » trinh va, trinh ve, trinh van
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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: theo chieu sach - hanh ((((trinh vi) OR (trinh viet))) or (trinh ven)) nhung cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((((trinh vi) OR (trinh viet))) OR (trinh ven)) nhung cong tap toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh ((((trinh vi) OR (trinh viet))) or (trinh ven)) nhung cong tap toan cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((((trinh vi) OR (trinh viet))) or (trinh ven)) nhung cong tap toan cao*.