Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
tuc va » thuc va, truc va, tuc xa
vi cua » di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (toc sach)) ky nang xa hoi. hieu ve cham tuc va hanh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (toc sach)) ky nang xa hoi. hieu ve cham tuc va hanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (toc sach)) ky nang xa hoi. hieu ve cham tuc va hanh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (toc sach)) ky nang xa hoi. hieu ve cham tuc va hanh ((vi cua) OR (vai cua)) tre*.