Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh va » hanh vi
truc va » thuc va, thuc vat, trung va
ty hang » ly hang, ty xang, thi hang
va hoi » xa hoi, va hoc, va hoa
va lam » van lam, va lap
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua
cua te » cua tu

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) OR (toc sach)) ty hang va hoi. lieu va lam ((xuc va) or (truc va)) hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty hang va hoi. lieu va lam ((xuc va) OR (truc va)) hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty hang va hoi. lieu va lam ((xuc va) or (truc va)) hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty hang va hoi. lieu va lam ((xuc va) or (truc va)) hanh va cua te*.