Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
tham thuc » nham thuc, tam thuc, thai thuc
hanh sinh » hanh tinh, hanh dinh, hinh sinh
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
sinh cua » manh cua, dinh cuu, sinh va
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sai » tu bai, tu san, tu cai
sai ky » sac ky

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 hoa. hieu van ((tham thuc) or (((pham thuc) or (nam thuc)))) va hanh sinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ma hoa. hieu van ((tham thuc) OR (((pham thuc) OR (nam thuc)))) va hanh sinh cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ma hoa. hieu van ((tham thuc) or (((pham thuc) or (nam thuc)))) va hanh sinh cua tre*.