Perhaps you should try some spelling variations:
thuc dant » thuoc dang, thuc hanh, thuc vat
vu khach » vu khanh, vu khac, vay khach
thuc dan » thuc hanh, hoc dan, thuc vat
vu sach » vu bach, su sach
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
ve nam » he nam, va nam, le nam
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (vu khach)) ky nang cao hoi. hieu ve nam ((thuc dan) or (thuc dant)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang cao hoi. hieu ve nam ((thuc dan) OR (thuc dant)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ky nang cao hoi. hieu ve nam ((thuc dan) or (thuc dant)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) ky nang cao hoi. hieu ve nam ((thuc dan) or (thuc dant)) hanh vi cua te*.