Perhaps you should try some spelling variations:
thien van » thi van
cau thuc » cuu thuc, can thuc, cau phuc
dan dinh » dang dinh, doan dinh, van dinh
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
dinh va » dinh van, dinh ve, tinh va
cau tre » cau tren, cau treo, cau tra
va cau » van cau, va cac, va dau

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) OR (cau truc)) 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) OR (cau truc)) dan dinh va cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) lang xa hoi. thien van ((cau thuc) OR (cau truc)) 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) OR (cau truc)) dan dinh va cau tre*.