Perhaps you should try some spelling variations:
thai thuc » thai thuy, thai tuc, tham thuc
pham thuc » phap thuc, pham chuc, nham thuc
hanh sinh » hanh tinh, hanh dinh, hinh sinh
hieu van » hieu va, thien van, lieu va
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
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 sai ky nang ma hoi. hieu van ((thai thuc) or (pham thuc)) va hanh sinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ma hoi. hieu van ((thai thuc) OR (pham thuc)) va hanh sinh cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ma hoi. hieu van ((thai thuc) or (pham thuc)) va hanh sinh cua tre*.