Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thuat lap » thuat lanh, thuat xay, thuat bai
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, va tinh, le thanh
te sach » toc sach
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuat lap)) ky nang xa hoi. hieu van cau duc ((va thanh) OR (ban thanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat lap)) ky nang xa hoi. hieu van cau duc ((va thanh) OR (ban thanh)) de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuat lap)) ky nang xa hoi. hieu van cau duc ((va thanh) OR (ban thanh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat lap)) ky nang xa hoi. hieu van cau duc ((va thanh) OR (ban thanh)) de cua tre*.