Perhaps you should try some spelling variations:
trung thanh » truong thanh
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
truong cao » truong dai
thong cong » trong cong, tong cong, thong thong
dat quang » dau quang, chat quang, dang quang
cong dat » cong dan, dong dat, cong da
quang va » quang van, quan va, quang ma

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 - thanh ((truong cao) or (trung thanh)) thong cong dat quang va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh ((truong cao) OR (trung thanh)) thong cong dat quang va.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh ((truong cao) or (trung thanh)) thong cong dat quang va*.