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 danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu ve cam xuc ((ban hanh) or (va danh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach hoi) OR (cach thoi)) nang o hoi. hieu ve cam xuc ((ban hanh) OR (va danh)) vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach hoi) OR (cach thoi)) nang o hoi. hieu ve cam xuc ((ban hanh) or (va danh)) vi cua tre*".