Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van lang » van nang, va lang, van hang
thuc dao » thuc dan, thuc day, chuc dao
dao hanh » dao thanh, dang hanh, ban hanh
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
ve cai » ve cac, ve tai, ve cau
va cai » va cac, va bai, va dai
va cao » va cac, va co, va dao
vi cua » vai cua, di cua
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 lang xa hoi. hieu ((((ve cai) or (va cai))) or (va cao)) thuc dao hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach van lang xa hoi. hieu ((((ve cai) OR (va cai))) OR (va cao)) thuc dao hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach van lang xa hoi. hieu ((((ve cai) or (va cai))) or (va cao)) thuc dao hanh vi cua te*.