Perhaps you should try some spelling variations:
thong cuong » thong chuong, thong cong, thong cung
hieu manh » chieu xanh, hieu nganh, dieu hanh
chau tinh » cuu tinh, ha tinh, cua tinh
tang suat » nang suat, tang luan, cong suat
tang luat » tang luan, nang suat, hang luan
cuong bai » uong bi, cuong ma
bai toan » bai tap
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: ho ((hieu manh) or (chau tinh)) - hanh ((tang suat) OR (tang luat)) thong cuong bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chau tinh)) - hanh ((tang suat) OR (tang luat)) thong cuong bai toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chau tinh)) - hanh ((tang suat) OR (tang luat)) thong cuong bai toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chau tinh)) - hanh ((tang suat) OR (tang luat)) thong cuong bai toan cao*.