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