Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham doc » cham soc, chat doc, chau doc
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
ca viet » va viet, co viet, hoa viet
doc va » duoc va, hoc va, duc va
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: ((thu sach) or (thu hoach)) ky nang x hoi. hieu vu cham doc va hanh di ((cua tre) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thu hoach)) ky nang x hoi. hieu vu cham doc va hanh di ((cua tre) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thu hoach)) ky nang x hoi. hieu vu cham doc va hanh di ((cua tre) or (ca viet))*.