Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cua suc » cua su, cua duc, cua tuc
qua cua » quan cua, quang cua, qua quan
ty nang » ky nang, ty xang, ty hang
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu qua cua suc ((va danh) OR (va hanh)) de ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu qua cua suc ((va danh) OR (va hanh)) de ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu qua cua suc ((va danh) OR (va hanh)) de ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu qua cua suc ((va danh) OR (va hanh)) de ((cua tre) or (cua te))*.