Perhaps you should try some spelling variations:
hoc duoc » hoc nuoc, hoa duoc, hoc dung
vu sach » vu bach, su sach, vu khach
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, me hoi
di cua » dai cua, doi cua, de 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 ky nang ((ma hoi) OR (ma hoa)). hieu ve ((hoc duoc) OR (hoc ung)) va tinh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((ma hoi) or (ma hoa)). hieu ve ((hoc duoc) or (hoc ung)) va tinh di cua tre*.