Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
vu kham » vu khanh
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
xa hanh » xa thanh, xa khanh, va hanh
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau
va cam » va cham, va cac, va cao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu kham)) ky nang x ho. hieu va cam tuc xa hanh ((vai cua) OR (lai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu kham)) ky nang x ho. hieu va cam tuc xa hanh ((vai cua) OR (lai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu kham)) ky nang x ho. hieu va cam tuc xa hanh ((vai cua) OR (lai cua)) tre*.