Perhaps you should try some spelling variations:
doan dinh » doan hinh, doan tinh, doan minh
thien van » thi van
cau thuc » cau truc, cuu thuc, can thuc
dan dinh » dang dinh, van dinh, dao dinh
sach ky » sac ky, sach ty, sach kem
van cau » van dau, van hau, van chat
lang xa » lang ha, dang xay, lang van
cao tre » cho tre, choi tre
va cao » va cac, va co, va dao

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) OR (doan dinh)) va cao 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) OR (doan dinh)) va cao 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 ((dan dinh) OR (doan dinh)) va cao tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) lang xa hoi. thien van cau thuc ((dan dinh) OR (doan dinh)) va cao tre*.