Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
thuc day » thuc dan, thuc vat
day dang » da dang, dai dang, day dan
hieu va » lieu va, hieu qua
dang de » dang deo, dung de, dang do
cua tre » cuu tre, cua triet, dua tren
vu sai » vu hai, vu san, vu dai
sai ky » sac ky
nang o » nang co, nang ho, nang ro
cua tu » cua tuc, cua su, cua cu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sai ky nang o hoi. hieu va cac thuc day dang de ((cua tre) or (((cua te) OR (cua tu))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sai ky nang o hoi. hieu va cac thuc day dang de ((cua tre) OR (((cua te) OR (cua tu)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sai ky nang o hoi. hieu va cac thuc day dang de ((cua tre) or (((cua te) OR (cua tu))))".
• Adding a wildcard symbol may retrieve word variants: vu sai ky nang o hoi. hieu va cac thuc day dang de ((cua tre) or (((cua te) OR (cua tu))))*.