Perhaps you should try some spelling variations:
hoc thuc » hoc huu
va tinh » may tinh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
cua tre » cuu tre, cua triet, dua tren
hieu va » lieu va, hieu qua
tinh va » tich va, trinh van, trinh vat
thuc va » thuc vat, thuc dan, thuc day
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky lang xa hoi. ((hieu ve) or (hieu va)) hoc thuc va tinh va ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang xa hoi. ((hieu ve) OR (hieu va)) hoc thuc va tinh va ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sac ky lang xa hoi. ((hieu ve) or (hieu va)) hoc thuc va tinh va ((cua tre) or (cua te))*.