Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh dai » hanh tai, hanh dao, vanh dai
chat luc » chat xuc, chat lua, nhan luc
va hanh » van hanh, va thanh, va danh
hieu ve » hieu van
hieu va » lieu va, hieu qua
luc va » duc va, tuc va, loc va
cua te » cua tu
v nang » va nang, vu nang, van nang

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 ((ky nang) or (v nang)) xa hoi. ((hieu ve) OR (hieu va)) chat luc va hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky nang) OR (v nang)) xa hoi. ((hieu ve) OR (hieu va)) chat luc va hanh dai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ky nang) or (v nang)) xa hoi. ((hieu ve) OR (hieu va)) chat luc va hanh dai cua te*".