Perhaps you should try some spelling variations:
nhung tuong » nhung huong, nhung phuong, hung vuong
chieu sang » chieu xanh, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh trang » thanh trung, canh tranh, hanh trinh
hieu lang » hieu quang, nhieu tang, hieu van
tuong dan » huong dan, tung dan, xuong dan
trang va » tran van, hang va
dan toan » van toan, dan than, manh 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: hoc ((((chieu sang) or (hieu lang))) or (chieu sach)) - hanh trang va nhung tuong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((chieu sang) OR (hieu lang))) OR (chieu sach)) - hanh trang va nhung tuong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((((chieu sang) or (hieu lang))) or (chieu sach)) - hanh trang va nhung tuong dan toan cau*.