Perhaps you should try some spelling variations:
dinh vai » dinh van, dinh vi, dinh va
co thuc » co thua, mo thuc, so thuc
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
do thuc » hoc thuc, dan thuc
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, sach ty, sach uu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cach tu » cach thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach tu) or (cach tu)) nang xa hoi. hieu va ((co thuc) OR (do thuc)) va dinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (cach tu)) nang xa hoi. hieu va ((co thuc) OR (do thuc)) va dinh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tu) or (cach tu)) nang xa hoi. hieu va ((co thuc) OR (do thuc)) va dinh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (cach tu)) nang xa hoi. hieu va ((co thuc) OR (do thuc)) va dinh vai cua tre*.