Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thi hang » thi hanh, thi nang, thi hong
hang xa » hoang xa, hang va, hang ca
van cam » van lam, van cau, van dam
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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