Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sang » chieu sach, chieu xanh, nhieu tang
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » hieu quang, nhieu tang, hieu van
tranh cua » doanh cua, manh cua
ban trong » bai trong, ban tuong, ben trong
trong dan » trong dang, trong san, trong tan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu tinh) OR (((chieu sang) OR (hieu lang)))) - hanh tranh cua ban trong dan than tap~.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu tinh) or (((chieu sang) or (hieu lang)))) - hanh tranh cua ban trong dan than tap*.