Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
hieu van » thien van, lieu va, hieu ve
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
tu sach » su sach, te sach, tu cach
y nang » ky nang, ly nang, v nang
vi cay » voi cay, va cay, si cay

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 (thu sach)) y nang mai hoi. ((hieu van) or (hieu va)) cam xuc van thanh vi cay thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang mai hoi. ((hieu van) OR (hieu va)) cam xuc van thanh vi cay thuoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang mai hoi. ((hieu van) or (hieu va)) cam xuc van thanh vi cay thuoc*.