Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
bac tuc » bac tu, bach tuoc, bac thua
van bac » van ban, van bao, van hac
cua tre » cua te, cuu tre, cua triet
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
nang xa » nang x, lang xa, mang xa
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

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