Perhaps you should try some spelling variations:
phap trinh » phap tinh, lap trinh, phap sinh
trinh vat » trinh van, trinh luat, sinh vat
hieu van » hieu va, thien van, lieu va
hoc phap » hoc phan, hoc phat, hoc pho
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
van lam » van nam
lam hoc » am hoc, lam hoa, tam hoc
vat cua » mat cua, bat cua, dat cua
cua tre » cua te, cuu tre, cua triet

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 ky ((lang xa) or (nang x)) hoi. hieu van lam hoc phap trinh vat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (nang x)) hoi. hieu van lam hoc phap trinh vat cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (nang x)) hoi. hieu van lam hoc phap trinh vat cua tre*.