Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham luc » cham soc, cham cuu, chat lua
nhan luc » nang luc
tinh bac » tinh cach, tinh hoc, tinh lao
hoc cac » hoc cao
hieu ve » hieu va, hieu van
va tinh » may tinh
bac cua » ban cua, tac cua, bai cua
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (hoc cac)) ky nang x ho. hieu ve ((cham luc) or (nhan luc)) va tinh bac cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc cac)) ky nang x ho. hieu ve ((cham luc) OR (nhan luc)) va tinh bac cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc cac)) ky nang x ho. hieu ve ((cham luc) or (nhan luc)) va tinh bac cua tre*.