Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh tai » thanh tai, hang tai, han tai
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
ve cac » va cac, vien cac
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: thuat sach ((ly nang) OR (ly vang)) x hoi. hieu ((va cau) or (ve cac)) duc va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((ly nang) OR (ly vang)) x hoi. hieu ((va cau) OR (ve cac)) duc va hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((ly nang) OR (ly vang)) x hoi. hieu ((va cau) or (ve cac)) duc va hanh tai cua tre*".