Perhaps you should try some spelling variations:
cam thuc » am thuc, cam thu, can thuc
hanh doi » thanh doi, hanh noi, hang doi
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
sang ma » tang ma, nang ma, sang tao
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach y) or (sac ky)) sang ma hoa. hieu van ((cam thuc) or (nam thuc)) va hanh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sac ky)) sang ma hoa. hieu van ((cam thuc) OR (nam thuc)) va hanh doi cua te.
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sac ky)) sang ma hoa. hieu van ((cam thuc) or (nam thuc)) va hanh doi cua te*.