Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cao duc » dao duc, cao suc, giao duc
hanh va » hang va, hanh vi
cac dac » cac dan, cac dai, cac bac
nong xa » song xa, dong xa, nong va
va cua » va chua, via cua, ca cua
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) OR (cach thuc)) nong xa hoi. hieu van ((cac dac) or (cao duc)) van hanh va cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((cach tu) OR (cach thuc)) nong xa hoi. hieu van ((cac dac) OR (cao duc)) van hanh va cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((cach tu) OR (cach thuc)) nong xa hoi. hieu van ((cac dac) or (cao duc)) van hanh va cua tu*".