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