Perhaps you should try some spelling variations:
nhung tuong » nhung huong, nhung phuong, hung vuong
nhieu tang » hieu lang, nhiet nang
hieu quang » thieu quang, hieu quan, hieu qua
chieu sang » chieu sach, chieu xanh, hieu lang
hanh thang » nhanh thang, thanh thang, hanh trang
tuong dan » huong dan, tung dan, xuong dan
thang va » hang va, trang va, thong 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 ((((nhieu tang) or (hieu quang))) or (chieu sang)) - hanh thang va nhung tuong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((nhieu tang) OR (hieu quang))) OR (chieu sang)) - hanh thang va nhung tuong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((((nhieu tang) or (hieu quang))) or (chieu sang)) - hanh thang va nhung tuong dan toan cau*.