Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
qua cac » cua cac
cac tuc » cac toc, cac tu, cac tac
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
x hoi » x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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 ty nang ((((x hoi) OR (xa hoi))) or (o hoi)). hieu qua cac tuc va thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty nang ((((x hoi) OR (xa hoi))) OR (o hoi)). hieu qua cac tuc va thanh san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty nang ((((x hoi) OR (xa hoi))) or (o hoi)). hieu qua cac tuc va thanh san cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty nang ((((x hoi) OR (xa hoi))) or (o hoi)). hieu qua cac tuc va thanh san cua tre*.