Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach ly » sach y, sach lo, sach ty
ly lang » ly hang, ly vang, le lang
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, xa hoi, va hoi
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly lang ((ha hoi) OR (ha noi)). hieu ve cam ((duc va) OR (thuc vat)) hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: vu sach ly lang ((ha hoi) or (ha noi)). hieu ve cam ((duc va) or (thuc vat)) hanh vi cua tre*.