Perhaps you should try some spelling variations:
van chat » cao chat
chat xuc » chat huu, cam xuc, chao xu
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
tu sach » thu sach, su sach, te sach
may hoi » may thoi, tay hoi, mai hoi
ky mang » ke mang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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 ((ky mang) OR (ky nang)) may hoi. hieu van chat xuc ((va danh) or (va hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky mang) OR (ky nang)) may hoi. hieu van chat xuc ((va danh) OR (va hanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky mang) OR (ky nang)) may hoi. hieu van chat xuc ((va danh) or (va hanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky mang) OR (ky nang)) may hoi. hieu van chat xuc ((va danh) or (va hanh)) dai cua tre*.