Perhaps you should try some spelling variations:
thue nang » thien nang, thuat nang, chuc nang
toc sach » hoc sach, doc sach, thuoc sach
thi nang » ki nang, thi hanh
thi cong » tai cong, thien cong
hanh dai » hanh tai, hanh dao, vanh dai
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((thue nang) OR (((thi nang) OR (thi cong)))) xa hoi. hieu va cac duc va hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((thue nang) or (((thi nang) OR (thi cong)))) xa hoi. hieu va cac duc va hanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((thue nang) or (((thi nang) OR (thi cong)))) xa hoi. hieu va cac duc va hanh dai cua tre*.