Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va cham » va chat, va tham
luy tre » luyen tre
xuc va » tuc va, luc va, xac va
vi luy » vi lua, vi luu

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. hieu va cham ((xuc va) or (duc va)) thanh vi luy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) _ lang xa hoi. hieu va cham ((xuc va) OR (duc va)) thanh vi luy tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) _ lang xa hoi. hieu va cham ((xuc va) or (duc va)) thanh vi luy tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) _ lang xa hoi. hieu va cham ((xuc va) or (duc va)) thanh vi luy tre*.