Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
tham thuc » pham thuc, tam thuc, thai thuc
pham thu » pham thuc, pham thi, pham tu
kinh tri » dinh tri, minh tri, tinh tri
hieu van » hieu va, thien van, lieu va
tri cuu » tri cua, tra cuu, trinh cuu
va kinh » va tinh, qua kinh
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
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 ma hoi. hieu van ((tham thuc) or (((pham thu) or (nham thuc)))) va kinh tri cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoi. hieu van ((tham thuc) OR (((pham thu) OR (nham thuc)))) va kinh tri cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu van ((tham thuc) or (((pham thu) or (nham thuc)))) va kinh tri cuu tre*.