Perhaps you should try some spelling variations:
day hanh » day nhanh, day thanh, dao hanh
sach van » sach han, sach va, bach van
thuc day » thuc dan, thuc vat
tu sach » thu sach, su sach, te sach
mang xa » mang may, dang xay, mang cua
lang xa » lang ha, dang xay, lang van
vi cua » vai cua, di cua
ve cai » va cai, ve cac, ve tai
va cam » va cham, va cac, va cao
cua te » cua tu

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 van ((mang xa) or (lang xa)) hoi. hieu ((ve cai) or (va cam)) thuc day hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach van ((mang xa) OR (lang xa)) hoi. hieu ((ve cai) OR (va cam)) thuc day hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach van ((mang xa) or (lang xa)) hoi. hieu ((ve cai) or (va cam)) thuc day hanh vi cua te*.