Perhaps you should try some spelling variations:
yen lang » den lang, ten lang, yen giang
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cam tuc » cam xuc, nam thuc, dam thuc
cua tuc » cua duc, cua tu, cua thuoc
o lang » hoa lang, hoi lang
cam tu » cam thu, nam tu, dam tu
vi cua » vai cua, di cua

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: te sach ((yen lang) OR (o lang)) xa hoi. hieu van ((cam tuc) OR (cam tu)) van hanh vi cua tuc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((yen lang) or (o lang)) xa hoi. hieu van ((cam tuc) OR (cam tu)) van hanh vi cua tuc~".
• Adding a wildcard symbol may retrieve word variants: te sach ((yen lang) or (o lang)) xa hoi. hieu van ((cam tuc) OR (cam tu)) van hanh vi cua tuc*.