Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tinh vat » trinh vat, sinh vat, tinh va
hoc phap » hoc phan, hoc phat, hoc chat
van lam » van nam
vat cua » mat cua, bat cua, dat cua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
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) OR (hoc pho)) 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) OR (hoc pho)) tinh vat cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) or (nang x)) hoi. hieu van lam ((hoc phap) OR (hoc pho)) 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) OR (hoc pho)) tinh vat cua tre*.