Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hieu ban » hieu van, dieu ban, lieu ban
ban hang » ngan hang
hang luc » nang luc, hang luan, hang truc
nang ma » tang ma, sang ma, nang cao
cua tre » cuu tre, cua triet, dua tren
va hanh » va thanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 y nang ma hoi. hieu ban hang luc ((va hanh) or (van hanh)) hai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. hieu ban hang luc ((va hanh) OR (van hanh)) hai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoi. hieu ban hang luc ((va hanh) or (van hanh)) hai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoi. hieu ban hang luc ((va hanh) or (van hanh)) hai ((cua tre) OR (cua te))*.