Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu sach » tu sach, thuat sach, thuoc sach
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
ve cham » va cham, ve chat, ve chim
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc 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) or (thu sach)) ky lang xa hoi. hieu ((ve cham) OR (vu cham)) xuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu sach)) ky lang xa hoi. hieu ((ve cham) OR (vu cham)) xuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (thu sach)) ky lang xa hoi. hieu ((ve cham) OR (vu cham)) xuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu sach)) ky lang xa hoi. hieu ((ve cham) OR (vu cham)) xuc va hanh vi cua tre*.