Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham luc » cham soc, nhan luc, cham cuu
hanh ky » hanh kem
hanh ly » khanh ly, hang ly, hanh y
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 6 tang, 5 tang
luc va » duc va, tuc va, loc va
7 tang » 6 tang

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 ((y tang) or (7 tang)) ma hoi. hieu ve cham luc va ((hanh ly) or (hanh ky)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y tang) OR (7 tang)) ma hoi. hieu ve cham luc va ((hanh ly) OR (hanh ky)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y tang) or (7 tang)) ma hoi. hieu ve cham luc va ((hanh ly) or (hanh ky)) cua tre*.