Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vinh cuu » sinh cua, dinh cu, tinh cua
dinh cuu » dinh chi
nang xa » nang x, lang xa, nang ma
vu cham » va cham, vu kham, tu cham
va danh » va dinh, va dan, va hanh
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam

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 cam) or (vu cham)) duc va danh ((vinh cuu) OR (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu ((ve cam) OR (vu cham)) duc va danh ((vinh cuu) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. hieu ((ve cam) or (vu cham)) duc va danh ((vinh cuu) OR (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu ((ve cam) or (vu cham)) duc va danh ((vinh cuu) OR (dinh cuu)) tre*.