Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thanh ly » thanh lay, thanh ky, thanh le
va thanh » gia thanh, ban thanh, va tinh
nhan luc » nang luc
cham luc » cham soc, cham cuu, chat lua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
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 ky sang ma hoa. ((hieu ve) or (hieu van)) ((cham luc) or (nhan luc)) va thanh ly cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky sang ma hoa. ((hieu ve) OR (hieu van)) ((cham luc) OR (nhan luc)) va thanh ly cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky sang ma hoa. ((hieu ve) or (hieu van)) ((cham luc) or (nhan luc)) va thanh ly cua tre*.