Perhaps you should try some spelling variations:
dinh dai » dinh dat, sinh dai, dinh dao
hieu van » hieu va, thien van, lieu va
van chat » cao chat
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ty) or (sac ky)) nang xa hoi. hieu van chat ((xuc va) OR (tuc va)) dinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sac ky)) nang xa hoi. hieu van chat ((xuc va) OR (tuc va)) dinh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) or (sac ky)) nang xa hoi. hieu van chat ((xuc va) OR (tuc va)) dinh dai cua tre*".