Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
cao hoat » cac hoat, co hoat, cao chat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
ve cam » ve cham, ve cac, va cam
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang cao hoat. hieu ve cam duc va dan vi ((((cua tu) OR (cua cu))) or (cay thuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoat. hieu ve cam duc va dan vi ((((cua tu) OR (cua cu))) OR (cay thuoc))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cao hoat. hieu ve cam duc va dan vi ((((cua tu) OR (cua cu))) or (cay thuoc))*".