Perhaps you should try some spelling variations:
thong cuong » thong chuong, thong cung, thong duong
thanh thang » nhanh thang, thanh thanh, thanh hang
nhieu tang » chieu sang, hieu lang, nhiet nang
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
thang he » tang he, thang nghe, thang nho
bai toan » bai tap
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 ((nhieu tang) or (chieu sach)) - thanh thang he ((thong cuong) OR (thong cong)) bai toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((nhieu tang) OR (chieu sach)) - thanh thang he ((thong cuong) OR (thong cong)) bai toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((nhieu tang) or (chieu sach)) - thanh thang he ((thong cuong) OR (thong cong)) bai toan tap".
• Adding a wildcard symbol may retrieve word variants: ho ((nhieu tang) or (chieu sach)) - thanh thang he ((thong cuong) OR (thong cong)) bai toan tap*.