Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
dai cay » dau cay, dai tay, doi cay
va dinh » van dinh, va kinh, va tinh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
va dau » va dao
ve cam » ve cham, ve cac, va cam
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 ((o hoi) or (o hai)). hieu ve cam xuc ((va dau) or (va dinh)) dai cay thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (o hai)). hieu ve cam xuc ((va dau) OR (va dinh)) dai cay thuoc.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (o hai)). hieu ve cam xuc ((va dau) or (va dinh)) dai cay thuoc*.