Perhaps you should try some spelling variations:
thien hieu » thien nhien, thien chien, thien hue
hieu quang » thieu quang, hieu quan, hieu qua
trinh vat » trinh van, trinh luat, sinh vat
trinh va » trinh van, trinh ve, trinh vi
cong dan » cong san, cong tan, cong dong
than cap » khan cap, thanh lap, thanh cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thien hieu quang - hanh ((trinh va) OR (trinh vat)) thong ((cong dan) or (huong dan)) than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien hieu quang - hanh ((trinh va) OR (trinh vat)) thong ((cong dan) OR (huong dan)) than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thien hieu quang - hanh ((trinh va) OR (trinh vat)) thong ((cong dan) or (huong dan)) than cap".
• Adding a wildcard symbol may retrieve word variants: thien hieu quang - hanh ((trinh va) OR (trinh vat)) thong ((cong dan) or (huong dan)) than cap*.