Perhaps you should try some spelling variations:
yen lang » den lang, ten lang, yen giang
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
y lang » o lang, tay lang
_ lang » o lang, _ land
ve cam » ve cham, ve cac, va cam
cam tu » cam thu, nam tu, dam tu
tu van » tu va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((((y lang) OR (yen lang))) or (_ lang)) xa hoi. hieu ve cam tu van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((((y lang) OR (yen lang))) OR (_ lang)) xa hoi. hieu ve cam tu van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((((y lang) OR (yen lang))) or (_ lang)) xa hoi. hieu ve cam tu van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((((y lang) OR (yen lang))) or (_ lang)) xa hoi. hieu ve cam tu van hanh vi cua tre*.