Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
vi cu » vi su, vi du
vi xu » va xu, ve xu, vi su

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