Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
loai hoc » logic hoc, loai khoa, dai hoc
hanh tai » thanh tai, hang tai, han tai
lai hoa » dai hoa
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve co » vo co, va co, de co

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 nang ((lai hoa) or (loai hoc)). hieu ve co tu va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky nang ((lai hoa) OR (loai hoc)). hieu ve co tu va hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky nang ((lai hoa) or (loai hoc)). hieu ve co tu va hanh tai cua tre*.