Perhaps you should try some spelling variations:
nang lai » nang tai, mang lai, nang cai
thanh di » thanh doi, thanh de, thanh do
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lai roi » lai hoi, loi roi
hieu va » hieu qua
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang lai roi. ((hieu va) OR (lieu va)) cam ((xuc va) or (tuc va)) thanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang lai roi. ((hieu va) OR (lieu va)) cam ((xuc va) OR (tuc va)) thanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang lai roi. ((hieu va) OR (lieu va)) cam ((xuc va) or (tuc va)) thanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang lai roi. ((hieu va) OR (lieu va)) cam ((xuc va) or (tuc va)) thanh di cua viet*.