Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, thai thuc
tam thuc » am thuc, nam thuc, dam thuc
nang mai » nang ma, nang tai, lang mai
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
vu cao » cu cao, va cao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu cao ky nang mai hoi. hieu ve ((tham thuc) OR (tam thuc)) va hanh va ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu cao ky nang mai hoi. hieu ve ((tham thuc) OR (tam thuc)) va hanh va ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: vu cao ky nang mai hoi. hieu ve ((tham thuc) OR (tam thuc)) va hanh va ((cua tre) or (cuu tre))*.