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
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
cua tuc » cua duc, cua tu, cua thuoc
hieu ve » hieu va
o lang » hoa lang, hoi lang
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 ve) OR (hieu van)) cam tuc 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 ve) OR (hieu van)) cam tuc van hanh vi cua tuc~".
• Adding a wildcard symbol may retrieve word variants: te sach ((yen lang) or (o lang)) xa hoi. ((hieu ve) OR (hieu van)) cam tuc van hanh vi cua tuc*.