Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
luc van » luoc van, luu van, duc van
hanh le » thanh le, hanh ve, hanh de
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi
le cua » ly 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 hoi) or (mai hoi)). hieu ve cham luc van hanh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((ma hoi) OR (mai hoi)). hieu ve cham luc van hanh le cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((ma hoi) or (mai hoi)). hieu ve cham luc van hanh le cua tre*.