Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc sai, thuoc san
thuoc dac » thuoc dang, thuoc sach, thuc dan
thanh lai » thanh hai, thanh lap, thanh loi
hang tai » hang va, dung tai
tai khoi » tai khoa, mai khoi, tao khoi
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
va thanh » gia thanh, ban thanh, va tinh
ky hang » ky nang, ly hang, ky dang
lai cua » dai cua, hai cua, lai chau
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: ((thuoc sac) OR (thuoc dac)) ky hang tai khoi. hieu van pham duc va thanh lai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sac) OR (thuoc dac)) ky hang tai khoi. hieu van pham duc va thanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sac) OR (thuoc dac)) ky hang tai khoi. hieu van pham duc va thanh lai cua te*.