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

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) OR (sac 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) OR (sac ky)) ((lang xa) OR (nang x)) hoi. hieu van lam hoc phap tinh vat cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac 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) OR (sac ky)) ((lang xa) or (nang x)) hoi. hieu van lam hoc phap tinh vat cua tre*.