Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan dau » phan tu, hang dau

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 manh) or (chieu sang)) - thanh trung va nhung cong tan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (chieu sang)) - thanh trung va nhung cong tan phan dau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (chieu sang)) - thanh trung va nhung cong tan phan dau*.