Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thuoc sac » thuoc sach, thuoc dac, thuoc sai
tang mai » tang ma, tang tai, lang mai
hieu sau » hieu su, hieu suat, tieu su
sau pham » san pham, su pham, cau pham
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
lai cua » hai cua, lai chau, thai cua
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sac ky tang mai hoi. hieu sau pham thuc va danh ((lai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky tang mai hoi. hieu sau pham thuc va danh ((lai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky tang mai hoi. hieu sau pham thuc va danh ((lai cua) or (dai cua)) tre*.