Perhaps you should try some spelling variations:
thien van » thi van
cau thuc » cau truc, cuu thuc, can thuc
dang xay » dang van, van xay
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
van cau » van dau, van hau, van chat
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, lang van
cau tra » ca tra, cau ra, cau truc
va cau » va cac, va dau, va cao

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