Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
truong va » truong dai, truong cao, truong dao
cong vang » cong lang, cong quang, cong ngang
ho chieu » theo chieu, hoc thieu, doi chieu
trung va » trang va, trung ha, trung tam
vang tai » hang tai, van tai, tang tai
tai tap » bai tap, tai tao, hai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - thanh ((trung va) or (truong va)) thong cong vang tai tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh ((trung va) OR (truong va)) thong cong vang tai tap.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh ((trung va) or (truong va)) thong cong vang tai tap*.