Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van thanh » ban thanh, van tuan
cua quoc » cua nuoc, cua thuoc
thanh va » thanh van, hanh va, thanh ha
xuc van » duc van, luc van, vuc van
cao xuc » cam xuc, cao duc, cao suc
qua cao » qua cac, qua ca, qua cai
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, lai hoi, mai doi
dai hoi » dai hoc, dai hai, dai moi
y nang » ky nang, ly nang, v nang
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: ((tu sach) or (thuat sach)) y nang ((mai hoi) or (dai hoi)). hieu qua cao xuc van thanh va cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) y nang ((mai hoi) OR (dai hoi)). hieu qua cao xuc van thanh va cua quoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) y nang ((mai hoi) or (dai hoi)). hieu qua cao xuc van thanh va cua quoc*.