Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
trinh vat » trinh van, trinh luat, sinh vat
thong van » trong van, thong va, thong quan
ho nhieu » hop nhieu, ho chieu, he nhieu
trinh ve » trinh he, trinh va, trinh vi
van toan » van tuan, van tan, van thanh
toan cau » toan cao, toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho nhieu tang - hanh ((trinh vat) OR (trinh ve)) thong thong van toan cau~.
• Adding a wildcard symbol may retrieve word variants: ho nhieu tang - hanh ((trinh vat) or (trinh ve)) thong thong van toan cau*.