Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hang cong » dang cong, hang nong, bang cong
theo cuu » theo chu, khao cuu, thao cua
anh mang » hanh mang, anh bang, anh dang
toan tai » doanh tai, toan ban, toan cao
toan tap » toan ban
mang va » mang vua, hang va, bang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo cuu van - anh mang va ((nhung cong) OR (hang cong)) thanh ((toan tai) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo cuu van - anh mang va ((nhung cong) OR (hang cong)) thanh ((toan tai) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo cuu van - anh mang va ((nhung cong) OR (hang cong)) thanh ((toan tai) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: theo cuu van - anh mang va ((nhung cong) OR (hang cong)) thanh ((toan tai) or (toan tap))*.