Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
dang hanh » dang thanh, ban hanh, dang van
cam thuc » am thuc, nam thuc, cam thu
dinh cuu » dinh chi
vu sach » vu bach, su sach, vu khach
hieu va » hieu qua
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
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) OR (lieu va)) cam thuc ((dang hanh) or (day thanh)) dinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. ((hieu va) OR (lieu va)) cam thuc ((dang hanh) OR (day thanh)) dinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. ((hieu va) OR (lieu va)) cam thuc ((dang hanh) or (day thanh)) dinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. ((hieu va) OR (lieu va)) cam thuc ((dang hanh) or (day thanh)) dinh cuu tre*.