Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, pham thu
nham thuc » nhan thuc, nam thuc, nham thu
hieu van » hieu va, thien van, lieu va
tam thuc » tham thuc, am thuc, nam thuc
cau treo » cau theo, cau tren, cau triet
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cau » va cau, ve cau, di cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cai ky nang ma hoi. hieu van ((tam thuc) or (((pham thuc) or (nham thuc)))) va hanh vi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky nang ma hoi. hieu van ((tam thuc) OR (((pham thuc) OR (nham thuc)))) va hanh vi cau treo.
• Adding a wildcard symbol may retrieve word variants: tu cai ky nang ma hoi. hieu van ((tam thuc) or (((pham thuc) or (nham thuc)))) va hanh vi cau treo*.