Perhaps you should try some spelling variations:
tham thuc » pham thuc, tam thuc, thai thuc
nham thuc » nhan thuc, nam thuc, nham thu
pham chuc » pham duc, pham huu, kham chua
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
di cuu » di cau, di cua, dinh cuu
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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 sang ma hoi. hieu van ((tham thuc) or (((pham chuc) or (nham thuc)))) va hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ma hoi. hieu van ((tham thuc) OR (((pham chuc) OR (nham thuc)))) va hanh di cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ma hoi. hieu van ((tham thuc) or (((pham chuc) or (nham thuc)))) va hanh di cuu tre*.