Perhaps you should try some spelling variations:
nang lai » nang tai, mang lai, nang cai
hanh dao » lanh dao, thanh dat, thanh dam
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
cam tuc » cam xuc, cam tu, dam thuc
dao cua » dai cua, day cua, dan cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » hieu van
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 ve) or (hieu va)) ((cam tuc) OR (nam thuc)) va hanh dao cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang lai hoa. ((hieu ve) OR (hieu va)) ((cam tuc) OR (nam thuc)) va hanh dao cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang lai hoa. ((hieu ve) or (hieu va)) ((cam tuc) OR (nam thuc)) va hanh dao cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang lai hoa. ((hieu ve) or (hieu va)) ((cam tuc) OR (nam thuc)) va hanh dao cua tre*.