Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, hieu cach
chieu sang » hieu lang, nhieu tang
chieu xanh » chieu tinh, hieu manh
dung cong » dung trong
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong san, cong thanh
tran tap » toan tap, tran tan, tran tuan
va dung » van dung, va duong, vat dung

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) or (((chieu sang) OR (chieu xanh)))) - thanh trung va dung cong tan tran tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (((chieu sang) OR (chieu xanh)))) - thanh trung va dung cong tan tran tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (((chieu sang) OR (chieu xanh)))) - thanh trung va dung cong tan tran tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (((chieu sang) OR (chieu xanh)))) - thanh trung va dung cong tan tran tap*.