Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
can tinh » canh tinh, ban tinh, cac tinh
thanh va » thanh van, hanh va, thanh ha
trinh va » trinh van, trinh vat, trinh ve
toan ban » van ban
hoc can » hoc dan, hoc cao, hoc cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc can tinh - canh ((thanh va) or (trinh va)) ((nhung cong) OR (dung cong)) manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc can tinh - canh ((thanh va) OR (trinh va)) ((nhung cong) OR (dung cong)) manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc can tinh - canh ((thanh va) or (trinh va)) ((nhung cong) OR (dung cong)) manh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc can tinh - canh ((thanh va) or (trinh va)) ((nhung cong) OR (dung cong)) manh toan ban*.