Perhaps you should try some spelling variations:
nang lai » nang tai, mang lai, nang cai
hieu van » thien van, lieu va, hieu ve
hanh dao » lanh dao, thanh dat, thanh dam
so sach » so sanh, bo sach, co sach
cam tuc » cam tu, nam thuc, dam thuc
dao cua » dai cua, day cua, dan cua
xa hanh » xa thanh, xa khanh, va hanh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
lai hoa » dai hoa, loai hoc

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

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