Perhaps you should try some spelling variations:
nhiet tach » chiet tach
hang nhung » hanh nhung, hong nhung, tang nhung
sang nhung » song nhung, dang hung, bang chung
hoc nhiet » hoc thiet, hoc nghien, hoc hien
tranh cua » doanh cua, manh cua
bai toan » bai tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nhiet tach - canh tranh cua ((hang nhung) OR (sang nhung)) bai toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nhiet tach - canh tranh cua ((hang nhung) OR (sang nhung)) bai toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc nhiet tach - canh tranh cua ((hang nhung) OR (sang nhung)) bai toan ban*.