Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
te cach » ve cach, te sach, tu cach
cac duc » cac du, cao duc, cac dac
vai cua » dai cua, hai cua, lai cua
cao suc » cao su, cao duc
nano xa » nano bac, nano cau, nano dua
cach tu » cach thuc
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cach tu ((nano xa) OR (nano va)) hoi. hieu van ((cac duc) or (cao suc)) van hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cach tu ((nano xa) OR (nano va)) hoi. hieu van ((cac duc) OR (cao suc)) van hanh vai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cach tu ((nano xa) OR (nano va)) hoi. hieu van ((cac duc) or (cao suc)) van hanh vai cua tu*".