Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua quoc » cua nuoc, cua thuoc
thanh de » hanh de, thanh ve, thanh do
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
cao xuc » cam xuc, cao suc, chat xuc
cao duc » dao duc, cao suc, giao duc
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
v nang » va nang, vu nang, van nang
de cua » le cua, te cua, dieu 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)) v nang mai hoi. hieu va ((cao xuc) OR (cao duc)) van thanh de cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) v nang mai hoi. hieu va ((cao xuc) OR (cao duc)) van thanh de cua quoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) v nang mai hoi. hieu va ((cao xuc) OR (cao duc)) van thanh de cua quoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) v nang mai hoi. hieu va ((cao xuc) OR (cao duc)) van thanh de cua quoc*.