Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
truong van » trong van, truong va, truong dai
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung van » trong van, trung va, trung tuan
dong cong » duong cong, dung cong, dang cong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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: doc ((hieu xanh) or (chieu sach)) - thanh ((trung van) OR (truong van)) dong cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu sach)) - thanh ((trung van) OR (truong van)) dong cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (chieu sach)) - thanh ((trung van) OR (truong van)) dong cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (chieu sach)) - thanh ((trung van) OR (truong van)) dong cong tan toan cau*.