Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
van tham » van thanh, van tuan, van tai
van chat » cao chat
danh dai » danh dau, danh di, danh sai
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
y nang » ky nang, ly nang, v nang
cua te » cua tu
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: ((hoc sach) OR (hoc sinh)) y nang x hoi. thien ((van tham) or (van chat)) thuc va danh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) y nang x hoi. thien ((van tham) OR (van chat)) thuc va danh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc sinh)) y nang x hoi. thien ((van tham) or (van chat)) thuc va danh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc sinh)) y nang x hoi. thien ((van tham) or (van chat)) thuc va danh dai cua te*.