Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
pham thu » pham thuc, pham thi, pham tu
nham thu » nham thuc, nam thu, nhan thuc
vinh cuu » dinh cuu, sinh cua, dinh cu
anh vinh » danh vinh, anh kinh, anh dinh
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
sai ky » sac ky
va anh » van anh, va danh, va hanh
ma hoi » mai hoi, xa hoi, ma hoa
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky nang ma hoi. hieu van ((tham thuc) or (((pham thu) or (nham thu)))) va anh vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ma hoi. hieu van ((tham thuc) OR (((pham thu) OR (nham thu)))) va anh vinh cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ma hoi. hieu van ((tham thuc) or (((pham thu) or (nham thu)))) va anh vinh cuu tre*.