Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach y, sach tu, sach thu
cuu tre » cau tren, cau treo
va hanh » van hanh, va danh, ban hanh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cua triet, dua tren
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: toc sach ty nang x hoi. hieu va cac xuc ((va hanh) or (va thanh)) dai ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang x hoi. hieu va cac xuc ((va hanh) OR (va thanh)) dai ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang x hoi. hieu va cac xuc ((va hanh) or (va thanh)) dai ((cuu tre) OR (cua tre))*".