Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
nong thong » nong thon, dong thong, tong thong
cong thong » cong thuong, cong trong, dong thong
trung cuu » trung cua, trung cau, truong cua
vang toan » van toan, dang toan, quang toan
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: doi ((chieu xanh) or (chieu sach)) - thanh trung cuu ((nong thong) OR (cong thong)) vang toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu xanh) OR (chieu sach)) - thanh trung cuu ((nong thong) OR (cong thong)) vang toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu xanh) or (chieu sach)) - thanh trung cuu ((nong thong) OR (cong thong)) vang toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu xanh) or (chieu sach)) - thanh trung cuu ((nong thong) OR (cong thong)) vang toan cau*.