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
hieu van » hieu va, thien van, lieu va
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cuu » vi luu, vinh cuu
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 thuc)))) va dinh vi 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 thuc)))) va dinh vi 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 thuc)))) va dinh vi cuu tre*.