Perhaps you should try some spelling variations:
chat luc » chat lua, nhan luc, chat huu
chat xuc » chat huu, cam xuc, chao xu
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh de » hanh ve, hanh kem
su sach » so sach, vu sach
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) ky nang x hoi. hieu vu ((chat luc) OR (chat xuc)) van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky nang x hoi. hieu vu ((chat luc) OR (chat xuc)) van hanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu sach)) ky nang x hoi. hieu vu ((chat luc) OR (chat xuc)) van hanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky nang x hoi. hieu vu ((chat luc) OR (chat xuc)) van hanh de cua tre*.