Perhaps you should try some spelling variations:
nhung tuong » nhung huong, nhung phuong, hung vuong
chieu sang » chieu sach, chieu xanh, nhieu tang
tran thanh » van thanh, quan thanh
hieu lang » hieu quang, nhieu tang, hieu van
ban thanh » ban hanh, ban hang
tuong anh » truong anh, tuong lanh, trong anh
tuan cau » toan cau, quan cau, tuan cu

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)) - hanh ((tran thanh) OR (ban thanh)) nhung tuong anh tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - hanh ((tran thanh) OR (ban thanh)) nhung tuong anh tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu lang)) - hanh ((tran thanh) OR (ban thanh)) nhung tuong anh tuan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - hanh ((tran thanh) OR (ban thanh)) nhung tuong anh tuan cau*.