Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh oai
thanh dat » thanh san, thanh hai, thanh van
cham luc » cham soc, nhan luc, cham cuu
su sach » so sach, vu sach
luc gia » luoc gia, duc gia, quoc gia
hieu va » lieu va, hieu qua
hieu vu » hieu ve, hieu su, dieu vu
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. ((hieu vu) OR (hieu va)) cham luc gia ((thanh dai) or (thanh dat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu vu) OR (hieu va)) cham luc gia ((thanh dai) OR (thanh dat)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu vu) OR (hieu va)) cham luc gia ((thanh dai) or (thanh dat)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu vu) OR (hieu va)) cham luc gia ((thanh dai) or (thanh dat)) cua tre*.