Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
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
dang de » dang deo, dung de, dang do
cua tre » cua te, cuu tre, dua tren
vu sai » vu hai, vu san, vu dai
sai ky » sac ky
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 sai ky nang x hoi. ((hieu va) or (hieu qua)) cac thuc day dang de ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sai ky nang x hoi. ((hieu va) OR (hieu qua)) cac thuc day dang de ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sai ky nang x hoi. ((hieu va) or (hieu qua)) cac thuc day dang de ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: vu sai ky nang x hoi. ((hieu va) or (hieu qua)) cac thuc day dang de ((cua tre) OR (cua triet))*.