Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
hanh co » anh co, danh co, hanh mo
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
me hoi » le hoi
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
co cua » con cua, ca cua, cong 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 (te sach)) y nang ((me hoi) or (ma hoa)). hieu va cac tuc va hanh co cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang ((me hoi) OR (ma hoa)). hieu va cac tuc va hanh co cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) y nang ((me hoi) or (ma hoa)). hieu va cac tuc va hanh co cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) y nang ((me hoi) or (ma hoa)). hieu va cac tuc va hanh co cua tre*.