Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nhan luc » nang luc
tinh bac » tinh cach, tinh hoc, tinh lao
cham luc » cham soc, cham cuu, chat lua
hieu ve » hieu van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
nang xa » nang x, lang xa, nang ma
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 ky nang xa hoi. ((hieu ve) OR (hieu va)) ((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 ky nang xa hoi. ((hieu ve) OR (hieu va)) ((cham luc) OR (nhan luc)) va tinh bac cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang xa hoi. ((hieu ve) OR (hieu va)) ((cham luc) or (nhan luc)) va tinh bac cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang xa hoi. ((hieu ve) OR (hieu va)) ((cham luc) or (nhan luc)) va tinh bac cua tre*.