Perhaps you should try some spelling variations:
thien van » thi van
dinh dien » tinh dien, kinh dien, dich dien
dau truc » cau truc, dai truc, doan truc
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
van dau » van dao, phan dau
truc va » thuc va, thuc vat, trung va
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 y ((nang xa) or (nang x)) hoi. thien van dau truc va ((dang dieu) or (dinh dien)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang x)) hoi. thien van dau truc va ((dang dieu) OR (dinh dien)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (nang x)) hoi. thien van dau truc va ((dang dieu) or (dinh dien)) cua tre*.