Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
sach ty » sach y, sach tu, sach thu
cam luc » cau luc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
ty lang » tay lang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
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 ty lang xa hoi. ((hieu ve) or (hieu va)) ((cam luc) or (cam xuc)) gia thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty lang xa hoi. ((hieu ve) OR (hieu va)) ((cam luc) OR (cam xuc)) gia thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty lang xa hoi. ((hieu ve) or (hieu va)) ((cam luc) or (cam xuc)) gia thanh vi cua tre*.