Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
cham luc » cham soc, cham cuu, chat lua
thanh ly » thanh lay, thanh ky, thanh le
doc sach » hoc sach, nuoc sach, dac sac
nhan luc » nang luc
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
cua tre » cua te, cuu tre, cua triet
y sang » _ sang, duy sang
ly cua » le 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) OR (doc sach)) y sang ma hoa. hieu ve ((cham luc) or (nhan luc)) gia thanh ly cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) y sang ma hoa. hieu ve ((cham luc) OR (nhan luc)) gia thanh ly cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y sang ma hoa. hieu ve ((cham luc) or (nhan luc)) gia thanh ly cua tre*".