Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
dua tren » dung tren
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
tu sac » tu sach, tu cac, tu san
nang o » nang co, nang ho, nang ro
tu ban » thu ban, te ban
cua te » cua tu
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: ((tu sac) or (tu ban)) ky nang o hoi. hieu va tham thuc va hanh vi ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu ban)) ky nang o hoi. hieu va tham thuc va hanh vi ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu ban)) ky nang o hoi. hieu va tham thuc va hanh vi ((dua tren) or (cua te))*.