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