Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
lang xa » lang ha, dang xay, lang van
van cam » van lam, van cau, van dam
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
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)) _ lang xa hoi. thien ((van cam) OR (van nam)) xuc va hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) _ lang xa hoi. thien ((van cam) OR (van nam)) xuc va hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) _ lang xa hoi. thien ((van cam) OR (van nam)) xuc va hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) _ lang xa hoi. thien ((van cam) OR (van nam)) xuc va hanh va cua te*.