Perhaps you should try some spelling variations:
phat sinh » phau sinh, phai sinh, phap sinh
thu sach » thuat sach, thuoc sach, thu hoach
sinh bat » sinh vat, sinh ban, sinh hoat
hoc phat » hoc phan, hoc pho
hieu van » hieu va, thien van, lieu va
bat cua » ban cua, mat cua, bai cua
lam hoc » am hoc, lam hoa, tam hoc
van lam » van nam
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
tu sach » su sach, te sach, tu cach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (tu sach)) ky ((lang ha) or (nang x)) hoi. hieu van lam hoc phat sinh bat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky ((lang ha) OR (nang x)) hoi. hieu van lam hoc phat sinh bat cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky ((lang ha) or (nang x)) hoi. hieu van lam hoc phat sinh bat cua tre*.