Perhaps you should try some spelling variations:
trinh giang » trinh giao, trinh giai, trinh tieng
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trinh gian » trinh giao, trinh giai, tinh gian
lang cong » dang cong, bang cong, hang cong
thuat cam » thuat dam, thuat chan, thuat co
cong van » cong vang, cong san, song van

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 gian) OR (trinh giang)) lang cong van ((thuat cam) or (thuat xay))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((trinh gian) OR (trinh giang)) lang cong van ((thuat cam) OR (thuat xay)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh ((trinh gian) OR (trinh giang)) lang cong van ((thuat cam) or (thuat xay))".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((trinh gian) OR (trinh giang)) lang cong van ((thuat cam) or (thuat xay))*.