Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
dang xay » dang van, van xay
va dinh » van dinh, va kinh, va tinh
duoc va » nuoc va, duc va, duoc ma
van lam » van nam
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
va cua » va chua, via cua, ma cua
ca cua » co cua

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 (dang xay)) hoi. hieu van lam duoc va dinh ((va cua) OR (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (dang xay)) hoi. hieu van lam duoc va dinh ((va cua) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) or (dang xay)) hoi. hieu van lam duoc va dinh ((va cua) OR (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (dang xay)) hoi. hieu van lam duoc va dinh ((va cua) OR (ca cua)) tre*.