Perhaps you should try some spelling variations:
hoc dinh » hoc sinh, hoc kinh, hoc danh
dinh ly » sinh ly, dinh le, trinh ly
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hieu ve » hieu van
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc dinh ly nang xa hoi. ((hieu va) or (hieu ve)) cam ((tuc va) or (duc va)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dinh ly nang xa hoi. ((hieu va) OR (hieu ve)) cam ((tuc va) OR (duc va)) hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc dinh ly nang xa hoi. ((hieu va) or (hieu ve)) cam ((tuc va) or (duc va)) hanh va cua tre*.