Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
manh anh » minh anh, anh anh, thanh anh
thu sach » thuat sach, thuoc sach, thu hoach
duc manh » suc manh, duc anh, duc minh
nhan duc » nhan duoc, nhan luc, phan duc
hieu va » lieu va, hieu qua
tu sach » su sach, te sach, tu cach
hieu ca » hieu cac, hieu cua, hieu xa
nang xa » nang x, lang xa, nang ma
v nang » va nang, vu nang, van nang
anh va » hanh 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: ((tu sach) or (thu sach)) v nang xa hoi. ((hieu ca) or (hieu va)) nhan duc manh anh va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) v nang xa hoi. ((hieu ca) OR (hieu va)) nhan duc manh anh va cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) v nang xa hoi. ((hieu ca) or (hieu va)) nhan duc manh anh va cua viet*.