Perhaps you should try some spelling variations:
nhung duong » nhung dung, nhung huong, nhung tuong
nhieu tang » chieu sang, nhiet nang
duong sach » duong manh
hieu lang » chieu sang, hieu quang, hieu van
sach toan » hach toan, sach tranh, hoach toan
tinh cua » trinh cua, sinh cua, tranh cua
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (nhieu tang)) - hanh ((tinh cua) OR (tinh chat)) nhung duong sach toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (nhieu tang)) - hanh ((tinh cua) OR (tinh chat)) nhung duong sach toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (nhieu tang)) - hanh ((tinh cua) OR (tinh chat)) nhung duong sach toan tap".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (nhieu tang)) - hanh ((tinh cua) OR (tinh chat)) nhung duong sach toan tap*.