Perhaps you should try some spelling variations:
nang lai » nang tai, mang lai, nang hai
hanh dao » lanh dao, thanh dat, thanh dam
nang cai » nang cao, nang tai, nang cap
co sach » bo sach, cuon sach, hoc sach
hieu va » lieu va, hieu qua
dao cua » dai cua, day cua, dan cua
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
tuc va » thuc va, truc va, tuc xa

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

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