Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
tuc va » thuc va, truc va, duc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sach)) ky lang xa hoi. hieu ve cac ((tuc va) OR (tuc xa)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) ky lang xa hoi. hieu ve cac ((tuc va) OR (tuc xa)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sach)) ky lang xa hoi. hieu ve cac ((tuc va) OR (tuc xa)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) ky lang xa hoi. hieu ve cac ((tuc va) OR (tuc xa)) hanh vi cua tre*.