Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
dau tieng » dau tien, cau tieng, day tieng
dau tren » dau tien, dat tren, dau trong
nang co » nang cao, nang doc, nang noi
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
vu cham » va cham, vu kham, tu cham
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va

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 co hoc. hieu ((va tham) or (vu cham)) xuc va hanh ve ((dau tren) OR (dau tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky nang co hoc. hieu ((va tham) OR (vu cham)) xuc va hanh ve ((dau tren) OR (dau tieng)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sac ky nang co hoc. hieu ((va tham) or (vu cham)) xuc va hanh ve ((dau tren) OR (dau tieng))".
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky nang co hoc. hieu ((va tham) or (vu cham)) xuc va hanh ve ((dau tren) OR (dau tieng))*.