Perhaps you should try some spelling variations:
hanh dinh » thanh dinh, hinh dinh, hanh tinh
toc sach » hoc sach, doc sach, thuoc sach
dinh cuu » dinh chi
ban hanh » ban hang
pham cua » pham ca, phat cua, ham cua
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
vu sach » vu bach, su sach, vu khach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (vu sach)) ky ((nang xa) OR (nang ma)) hoi. hieu ve pham cua ban hanh dinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (vu sach)) ky ((nang xa) OR (nang ma)) hoi. hieu ve pham cua ban hanh dinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (vu sach)) ky ((nang xa) OR (nang ma)) hoi. hieu ve pham cua ban hanh dinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (vu sach)) ky ((nang xa) OR (nang ma)) hoi. hieu ve pham cua ban hanh dinh cuu tre*.