Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hanh tai » thanh tai, hang tai, han tai
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
cac luc » cau luc, coc luc, cac nuoc
tai cuu » tai cuc, tai buu, tai cua
luc van » luoc van, luu van, duc van
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((su sach) or (toc sach))) or (hoc sach)) ky nang xa hoi. hieu ve cac luc van hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((su sach) OR (toc sach))) OR (hoc sach)) ky nang xa hoi. hieu ve cac luc van hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((((su sach) or (toc sach))) or (hoc sach)) ky nang xa hoi. hieu ve cac luc van hanh tai cuu tre*.