Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
chat luc » chat xuc, chat lua, nhan luc
doanh va » doan va, doanh tai, doanh cua
va doanh » van doanh, vay doanh, va danh
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
ky tang » ky nang, kho tang, ky trong
ky lang » ky nang, tay lang
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((((ky lang) OR (ky tang))) or (ky dang)) xa hoi. hieu ve chat luc va doanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((((ky lang) OR (ky tang))) OR (ky dang)) xa hoi. hieu ve chat luc va doanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((((ky lang) OR (ky tang))) or (ky dang)) xa hoi. hieu ve chat luc va doanh va cua tre*".