Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
ve cach » va cach, ve cac, ve canh
cach tu » cach thuc
cua tre » cua te, cuu tre, cua triet
y lang » o lang, yen lang
_ lang » o lang, _ land
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: toc sach ((((y lang) or (tay lang))) or (_ lang)) xa hoi. hieu ve cach tu van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((((y lang) OR (tay lang))) OR (_ lang)) xa hoi. hieu ve cach tu van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((((y lang) or (tay lang))) or (_ lang)) xa hoi. hieu ve cach tu van hanh vi cua tre*.