Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
doc sach » hoc sach, nuoc sach, dac sac
noi hoi » noi doi, doi hoi, hoi hoi
hieu va » lieu va, hieu qua
cao xuc » cam xuc, cao duc, cao suc
xuc van » duc van, luc van, vuc van
tai cua » thai cua, tai cuc, tri cua
y nang » ly nang, v nang, may nang
va cao » va cac, va co, va dao
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (doc sach)) ((y nang) OR (ky nang)) noi hoi. hieu va cao xuc van hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ((y nang) OR (ky nang)) noi hoi. hieu va cao xuc van hanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (doc sach)) ((y nang) OR (ky nang)) noi hoi. hieu va cao xuc van hanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) ((y nang) OR (ky nang)) noi hoi. hieu va cao xuc van hanh tai cua te*.