Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thuc ban » thuoc ban, thuc dan, thu ban
hanh vai » hanh vi, hanh tai, hanh van
cua viet » ca viet, hoa viet, cua vat
nang van » dang van, tang van, lang van
hieu va » hieu qua
van hoi » van hoa, van hoc, van hoe
hanh va » hang va, hanh vi
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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 ky nang van hoi. ((hieu va) or (lieu va)) tham thuc ban ((hanh vai) OR (hanh va)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang van hoi. ((hieu va) OR (lieu va)) tham thuc ban ((hanh vai) OR (hanh va)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang van hoi. ((hieu va) or (lieu va)) tham thuc ban ((hanh vai) OR (hanh va)) cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang van hoi. ((hieu va) or (lieu va)) tham thuc ban ((hanh vai) OR (hanh va)) cua viet*.