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