Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua quoc » cua nuoc, cua thuoc
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
vuc van » duc van, luc van, thuc van
cam vuc » cam xuc
tu sach » su sach, te sach, tu cach
hieu ve » hieu va
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di 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 (thu sach)) y nang mai hoi. ((hieu ve) OR (hieu van)) cam vuc van thanh vi cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang mai hoi. ((hieu ve) OR (hieu van)) cam vuc van thanh vi cua quoc*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang mai hoi. ((hieu ve) OR (hieu van)) cam vuc van thanh vi cua quoc*".