Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
anh gian » anh giang, anh giao, manh giang
gian cua » gian xu, ban cua
nang xa » nang x, lang xa, nang ma
duc van » duc tan, duc manh, duc phan
cua tre » cua te, cuu tre, cua triet

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 (toc sach)) ky nang xa hoi. hieu van thanh ((duc van) OR (duc va)) anh gian cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang xa hoi. hieu van thanh ((duc van) OR (duc va)) anh gian cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky nang xa hoi. hieu van thanh ((duc van) OR (duc va)) anh gian cua tre*".