Perhaps you should try some spelling variations:
dao thuc » dan thuc, dao tuc, do thuc
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
qua dao » lua dao, qua da, cua dao
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
ve cua » le cua, te cua, ve cum
de cua » le cua, te cua, dieu cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach o lang xa hoi. hieu qua dao thuc va hanh ((ve cua) or (de cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach o lang xa hoi. hieu qua dao thuc va hanh ((ve cua) OR (de cua)) te.
• Adding a wildcard symbol may retrieve word variants: tu sach o lang xa hoi. hieu qua dao thuc va hanh ((ve cua) or (de cua)) te*.