Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh vai » thanh hai, thanh tai, thanh oai
cham luc » cham soc, nhan luc, cham cuu
su sach » so sach, vu sach
va cham » va chat, va tham
luc gia » luoc gia, duc gia, quoc gia
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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