Perhaps you should try some spelling variations:
vu sach » vu bach, vu khach
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
su sach » so sach
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
ve cac » va cac, vien cac
tuc va » thuc va, truc va, duc va
di cua » dai cua, doi cua, de 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 (su sach)) ky lang ha hoi. hieu ve cac ((tuc va) OR (tuc xa)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky lang ha hoi. hieu ve cac ((tuc va) OR (tuc xa)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (su sach)) ky lang ha hoi. hieu ve cac ((tuc va) OR (tuc xa)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky lang ha hoi. hieu ve cac ((tuc va) OR (tuc xa)) hanh di cua tre*.