Perhaps you should try some spelling variations:
thanh giau » thanh gian, thanh giang, thanh lieu
nuoc sach » nguoi sach, hoc sach, cuoc cach
hieu van » hieu va, thien van, lieu va
giau cua » gian cua, gia cua, dieu cua
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
lo van » le van, vo van, do van
so van » su van, vo van
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: nuoc sach ky nang x hoi. ((hieu ve) or (hieu van)) cac ((lo van) OR (so van)) thanh giau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ky nang x hoi. ((hieu ve) OR (hieu van)) cac ((lo van) OR (so van)) thanh giau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ky nang x hoi. ((hieu ve) or (hieu van)) cac ((lo van) OR (so van)) thanh giau cua tre".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ky nang x hoi. ((hieu ve) or (hieu van)) cac ((lo van) OR (so van)) thanh giau cua tre*.