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

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) OR (dan va)) ((cua tu) 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) OR (dan va)) ((cua tu) 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) OR (dan va)) ((cua tu) or (cay thuoc))*".