Perhaps you should try some spelling variations:
hoc thuc » hoc huu
dan thuc » dan toc, am thuc
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca 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: su sac ky lang xa hoi. hieu ve ((hoc thuc) OR (dan thuc)) va tinh va cua tre~.
• Adding a wildcard symbol may retrieve word variants: su sac ky lang xa hoi. hieu ve ((hoc thuc) or (dan thuc)) va tinh va cua tre*.