Perhaps you should try some spelling variations:
thien van » thi van
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan dinh » dang dinh, doan dinh, van dinh
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
van cau » van dau, van hau, van chat
dinh va » dinh van, dinh ve, tinh va
cau tre » cau tren, cau treo, cau tra
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 hoi. thien van cau thuc dan dinh va cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) lang xa hoi. thien van cau thuc dan dinh va cau tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) lang xa hoi. thien van cau thuc dan dinh va cau tre*.