Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
hieu hien » bieu hien, dieu hien, chieu chien
hanh vai » hanh vi, hanh va, hanh tai
hien cac » thien cac, vien cac, hieu cac
toc sach » hoc sach, doc sach, thuoc sach
cao hoi » cau hoi, co hoi, cao hoc
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
cac lo » cac lop, cac co, cac bo
cua tu » cua tuc, cua su, cua cu
lo va » lo van, lao va, ly va

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) or (toc sach)) ky nang cao hoi. hieu hien cac lo va hanh vai ((cua tu) or (cua thuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang cao hoi. hieu hien cac lo va hanh vai ((cua tu) OR (cua thuoc)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang cao hoi. hieu hien cac lo va hanh vai ((cua tu) or (cua thuoc))*.