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 vi » hanh vi, anh va, anh ve
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)) v nang xa hoi. ((hieu ca) or (hieu va)) nhan duc manh anh vi 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 vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) v nang xa hoi. ((hieu ca) or (hieu va)) nhan duc manh anh vi 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 vi cua viet*.