Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
nhung cong » dung cong, thong cong, hang cong
trung cam » trung tam, trung cap, trung ca
trung nam » trung tam, trong nam, trung cap
cong van » cong vang, cong san, song van
van tuan » van quan, van ban, anh tuan
tuan cau » toan cau, quan cau, tuan cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (nhieu tang)) - thanh ((trung cam) OR (trung nam)) nhung cong van tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (nhieu tang)) - thanh ((trung cam) OR (trung nam)) nhung cong van tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (nhieu tang)) - thanh ((trung cam) OR (trung nam)) nhung cong van tuan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (nhieu tang)) - thanh ((trung cam) OR (trung nam)) nhung cong van tuan cau*.