Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
vien cac » vien bach, vien dai, vien da
thuc dao » thuc dan, thuc day, chuc dao
dao hanh » dao thanh, dang hanh, ban hanh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
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 nang xa hoi. hieu ((vien cac) 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 nang xa hoi. hieu ((vien cac) OR (va cao)) thuc dao hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach van nang xa hoi. hieu ((vien cac) or (va cao)) thuc dao hanh vi cua te*.