Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van vanh » van anh, van hanh, van manh
vanh dai » van dai, vanh tai, lanh dao
te sach » toc sach
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
luc van » luoc van, luu van, duc van
ve cau » ke cau, va cau, ve cac
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: ((te sach) or (thu sach)) ky nang x hoi. hieu ve cau luc van vanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky nang x hoi. hieu ve cau luc van vanh dai cua te*.