Perhaps you should try some spelling variations:
chat duc » chat xuc, chat doc, chet duoc
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
va hanh » va thanh, va danh, ban hanh
bai cua » ban cua, bai ca, hai cua
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang x hoi. hieu ve chat duc ((va hanh) or (van hanh)) ((bai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ve chat duc ((va hanh) OR (van hanh)) ((bai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ve chat duc ((va hanh) or (van hanh)) ((bai cua) or (dai cua)) tre*.