Perhaps you should try some spelling variations:
hanh sinh » hanh tinh, hanh dinh, hinh sinh
hieu van » hieu va, thien van, lieu va
sinh cua » manh cua, dinh cuu, sinh va
duc van » duc va, duc tan, duc manh
luc van » luoc van, luu van, luc va
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty hang ((x hoi) OR (xa hoi)). hieu van cam ((luc van) or (duc van)) hanh sinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang ((x hoi) OR (xa hoi)). hieu van cam ((luc van) OR (duc van)) hanh sinh cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty hang ((x hoi) OR (xa hoi)). hieu van cam ((luc van) or (duc van)) hanh sinh cua tre*".