Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
cao tuc » dao tuc, cao duc, cao suc
qua cao » qua cac, qua ca, qua cai
va dan » ca dan, va dao, va dau
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: thuoc sach ((thu nang) or (thu hang)) x hoi. hieu qua cao tuc ((va danh) OR (va dan)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((thu nang) OR (thu hang)) x hoi. hieu qua cao tuc ((va danh) OR (va dan)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((thu nang) or (thu hang)) x hoi. hieu qua cao tuc ((va danh) OR (va dan)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((thu nang) or (thu hang)) x hoi. hieu qua cao tuc ((va danh) OR (va dan)) vai cua te*.