Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham tuc » nham thuc, pham thuc, cham soc
toc sach » hoc sach, doc sach, thuoc sach
van tuan » van quan, van ban, anh tuan
tuan di » tuan do, truan doi, quan doi
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang xa hoi. lieu va ((cham tuc) OR (tham thuc)) van tuan di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty nang xa hoi. lieu va ((cham tuc) OR (tham thuc)) van tuan di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty nang xa hoi. lieu va ((cham tuc) OR (tham thuc)) van tuan di cua tre*.