Perhaps you should try some spelling variations:
tran thuat » trong thuat, trien thuat, tran tuan
nhung cong » dung cong, thong cong, hang cong
hanh tran » hanh trang, thanh tran, hanh tram
hung cong » hung cuong, phung cong, dung cong
ho trieu » mot trieu, 25 trieu, 30 trieu
ban toan » ban than, van toan, bao toan
bai toan » bai 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 trieu tinh - hanh tran thuat ((hung cong) or (nhung cong)) ((ban toan) OR (bai toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho trieu tinh - hanh tran thuat ((hung cong) OR (nhung cong)) ((ban toan) OR (bai toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho trieu tinh - hanh tran thuat ((hung cong) or (nhung cong)) ((ban toan) OR (bai toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho trieu tinh - hanh tran thuat ((hung cong) or (nhung cong)) ((ban toan) OR (bai toan)) cau*.