Perhaps you should try some spelling variations:
thuc dant » thuoc dang, thuc hanh, thuc vat
thuc dan » thuc hanh, hoc dan, thuc vat
vu sach » vu bach, su sach, vu khach
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, xa hoi, ma hoa
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 ((ky sang) OR (ky dang)) ma 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 ((ky sang) OR (ky dang)) ma 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 ((ky sang) OR (ky dang)) ma hoi. hieu ve nam ((thuc dan) or (thuc dant)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky sang) OR (ky dang)) ma hoi. hieu ve nam ((thuc dan) or (thuc dant)) hanh vi cua te*.