Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
dinh lam » dinh van, tinh lao
su sach » so sach, vu sach
vu pham » su pham, vi pham, vu kham
hieu vu » hieu va, hieu ve, hieu su
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty tang ((ma hoi) OR (xa hoi)). hieu vu pham duc va ((dinh lam) or (thanh lap)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty tang ((ma hoi) OR (xa hoi)). hieu vu pham duc va ((dinh lam) OR (thanh lap)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty tang ((ma hoi) OR (xa hoi)). hieu vu pham duc va ((dinh lam) or (thanh lap)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty tang ((ma hoi) OR (xa hoi)). hieu vu pham duc va ((dinh lam) or (thanh lap)) cua tre*.