Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu nang » thu hang, thu bang, tho nang
thi nang » thi cong, ki nang, thi hanh
chat luc » chat xuc, chat lua, nhan luc
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
luc van » luoc van, luu van, duc van
van han » van hanh, van phan, van nhan
han tai » hang tai, nhan tai, van tai
tai cua » thai cua, tai cuc, tri cua
cua tu » cua tuc, cua su, cua cu
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: toc sach ((thu nang) or (thi nang)) x hoi. hieu va chat luc van han tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((thu nang) OR (thi nang)) x hoi. hieu va chat luc van han tai cua tu.
• Adding a wildcard symbol may retrieve word variants: toc sach ((thu nang) or (thi nang)) x hoi. hieu va chat luc van han tai cua tu*.