Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
ve cham » va cham, ve chat, vu cham
va hanh » va thanh, va danh, ban hanh
ca viet » va viet, co viet, hoa viet
y nang » ky nang, ly nang, v nang
ve cai » va cai, ve cac, ve tai
vi ca » vit ca, li ca, va ca

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 xa hoi. hieu ((ve cai) or (ve cham)) xuc ((va hanh) OR (van hanh)) vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu ((ve cai) OR (ve cham)) xuc ((va hanh) OR (van hanh)) vi ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. hieu ((ve cai) or (ve cham)) xuc ((va hanh) OR (van hanh)) vi ca viet".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu ((ve cai) or (ve cham)) xuc ((va hanh) OR (van hanh)) vi ca viet*.