Perhaps you should try some spelling variations:
phap tinh » phap sinh, phap tieng, phap tang
hieu van » hieu va, thien van, lieu va
hoc phap » hoc phan, hoc phat, hoc pho
tinh vat » trinh vat, sinh vat, tinh va
te sach » toc 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: te sach ky ((lang xa) or (nang x)) hoi. hieu van lam hoc phap tinh vat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (nang x)) hoi. hieu van lam hoc phap tinh vat cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (nang x)) hoi. hieu van lam hoc phap tinh vat cua tre*.