Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang van » dang van, tang van, lang van
sach ky » sac ky, sach y, sach ty
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
loc va » luc 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 ky nang van hoi. hieu ve cam ((((loc va) or (duc va))) or (hoc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang van hoi. hieu ve cam ((((loc va) OR (duc va))) OR (hoc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang van hoi. hieu ve cam ((((loc va) or (duc va))) or (hoc va)) hanh vi cua tre*.