Perhaps you should try some spelling variations:
bo sach » co sach, hoc sach
thi cuu » thi cuc, thi huu, thi cu
dau thi » cau thi, dan thi, dao thi
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cuu tre » cua tre, cau tren, cau treo
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: bo sach ty ((nang xa) or (nang ma)) hoi. lieu va cac ((xuc va) or (tuc va)) dau thi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty ((nang xa) OR (nang ma)) hoi. lieu va cac ((xuc va) OR (tuc va)) dau thi cuu tre.
• Adding a wildcard symbol may retrieve word variants: bo sach ty ((nang xa) or (nang ma)) hoi. lieu va cac ((xuc va) or (tuc va)) dau thi cuu tre*.