Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
qua cac » cua cac
cac tac » cac toc, cac bac, cac dac
va hanh » van hanh, va thanh, va danh
hanh ca » hanh cac, hanh cat, hanh cua
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tac va » tac da, tac xa, tuc va

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 y nang ma hoi. hieu qua cac tac va hanh ca ((cuu tre) OR (cua tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu qua cac tac va hanh ca ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu qua cac tac va hanh ca ((cuu tre) OR (cua tre))*.