Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
quang tay » quang tuan, quang tran, quang thai
mang tay » mang may, bang tay, muong tay
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
hanh va » hang va, hanh vi
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va hoa » van hoa, va hoc, 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 sac ky ((mang tay) OR (quang tay)) hoi. ((hieu qua) or (lieu va)) tham thuc dan hanh va hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((mang tay) OR (quang tay)) hoi. ((hieu qua) OR (lieu va)) tham thuc dan hanh va hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((mang tay) OR (quang tay)) hoi. ((hieu qua) or (lieu va)) tham thuc dan hanh va hoa viet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((mang tay) OR (quang tay)) hoi. ((hieu qua) or (lieu va)) tham thuc dan hanh va hoa viet*.