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

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) OR (tuc va)) hanh ve dau tren~.
• 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) OR (tuc va)) hanh ve dau tren.
• 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) OR (tuc va)) hanh ve dau tren".
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky nang co hoc. hieu ((va tham) or (vu cham)) ((xuc va) OR (tuc va)) hanh ve dau tren*.