Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, danh trung
chieu sach » chinh sach, chiet tach, chieu sang
manh trung » manh tung, thanh trung, manh hung
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong may » cong xay, cong ma, cong hay
may hoan » may khoan, mai hoang, may san
hoan cau » toan cau, hoa cau, hoang cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (hieu lang)) - ((hanh trung) or (manh trung)) cua dung cong may hoan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (hieu lang)) - ((hanh trung) OR (manh trung)) cua dung cong may hoan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (hieu lang)) - ((hanh trung) or (manh trung)) cua dung cong may hoan cau*.