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
thi hang » thi hanh, thi nang, thi hong
luoc van » luoc can, luoc va, luc van
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
ty hang » ly hang, ty xang, thu hang
cua tre » cua te, cuu tre, cua triet
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: tu sach ((ty hang) OR (thi hang)) x hoi. hieu van cam ((luoc 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) OR (thi hang)) x hoi. hieu van cam ((luoc 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) OR (thi hang)) x hoi. hieu van cam ((luoc van) or (duc van)) hanh sinh cua tre*".