Perhaps you should try some spelling variations:
thien van » thi van
dan dinh » dang dinh, doan dinh, van dinh
thuc dan » thuc hanh, hoc dan, thuc vat
cau thuc » cau truc, cuu thuc, can thuc
van cau » van dau, van hau, van chat
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
va cao » va co, va dao, va bao

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 cao) OR (va cac)) 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 cao) OR (va cac)) 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 ((va cao) OR (va cac)) 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 cao) OR (va cac)) tre*.