Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
sach hoi » sach doi, sach moi, hoach hoi
ban hanh » ban hang
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach hoi) OR (cach thoi)) nang x ho. hieu ve cam xuc ((ban hanh) or (va dinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach hoi) OR (cach thoi)) nang x ho. hieu ve cam xuc ((ban hanh) OR (va dinh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach hoi) OR (cach thoi)) nang x ho. hieu ve cam xuc ((ban hanh) or (va dinh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach hoi) OR (cach thoi)) nang x ho. hieu ve cam xuc ((ban hanh) or (va dinh)) vi cua tre*.