Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu quang » thieu quang, hieu quan, hieu qua
thanh tung » thanh cong
tung cap » trung cap, cung cap, thong cap
cap hang » cap hoang, cap bang, cap han
nong tan » nong dan, nong san, nong van
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan 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) or (hieu quang)) - thanh tung cap hang ((nong tan) OR (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu quang)) - thanh tung cap hang ((nong tan) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (hieu quang)) - thanh tung cap hang ((nong tan) OR (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu quang)) - thanh tung cap hang ((nong tan) OR (cong tan)) toan cau*.