Perhaps you should try some spelling variations:
tham thuc » nham thuc, tam thuc, thai thuc
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cuu » vi luu, vinh cuu

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 thuc) or (nam thuc)))) va hanh vi 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 thuc) OR (nam thuc)))) va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu van ((tham thuc) or (((pham thuc) or (nam thuc)))) va hanh vi cuu tre*.