Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
tham thuc » pham thuc, tam thuc, thai thuc
hieu van » hieu va, thien van, lieu va
pham huu » pham duc, pham duy, phan huy
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
vi cuu » vi luu, vinh cuu
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan 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 san ky nang ma hoi. hieu van ((tham thuc) or (((pham huu) or (nham thuc)))) va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ma hoi. hieu van ((tham thuc) OR (((pham huu) OR (nham thuc)))) va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ma hoi. hieu van ((tham thuc) or (((pham huu) or (nham thuc)))) va hanh vi cuu tre*.