Perhaps you should try some spelling variations:
dang hanh » dang thanh, ban hanh, dang van
dat khanh » duy khanh
van khanh » van thanh, van hanh, van anh
cam thuc » am thuc, nam thuc, cam thu
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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