Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
cham duc » pham duc, cham soc, pham duy
dau tren » dau tien, dat tren, dau tieng
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
ca tren » cau tren, cu tren, la tren
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu ve cham duc va hanh vi ((cua te) or (((dau tren) or (ca tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky nang o hoi. hieu ve cham duc va hanh vi ((cua te) OR (((dau tren) OR (ca tren)))).
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky nang o hoi. hieu ve cham duc va hanh vi ((cua te) or (((dau tren) or (ca tren))))*.