Perhaps you should try some spelling variations:
dinh dien » tinh dien, kinh dien, dich dien
danh dieu » dang dieu, dan dieu, danh dien
dau truc » cau truc, dai truc, doan truc
hieu van » hieu va, thien van, lieu va
truc va » thuc va, thuc vat, trung va
van dau » van dao, phan dau
sach ky » sac ky, sach y, sach kem
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet

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

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