Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
dinh vi » dinh ve, dinh tri, dinh thi
te bai » te bao, te tai, te ban
tuc va » thuc va, truc va, tuc xa
bai ky » ban ky, sai ky, bac ky
xuc va » duc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te bai ky lang xa hoi. hieu van nam ((xuc va) or (tuc va)) ((dinh vi) OR (dinh viet)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te bai ky lang xa hoi. hieu van nam ((xuc va) OR (tuc va)) ((dinh vi) OR (dinh viet)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te bai ky lang xa hoi. hieu van nam ((xuc va) or (tuc va)) ((dinh vi) OR (dinh viet)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te bai ky lang xa hoi. hieu van nam ((xuc va) or (tuc va)) ((dinh vi) OR (dinh viet)) cua tre*.