Perhaps you should try some spelling variations:
thuc dant » thuoc dang, thuc hanh, thuc day
thuc dan » thuc hanh, hoc dan
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
vi cua » vai cua, di cua
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 nang cao hoi. hieu ve nam ((thuc dan) or (((thuc dant) OR (thuc vat)))) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang cao hoi. hieu ve nam ((thuc dan) OR (((thuc dant) OR (thuc vat)))) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang cao hoi. hieu ve nam ((thuc dan) or (((thuc dant) OR (thuc vat)))) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang cao hoi. hieu ve nam ((thuc dan) or (((thuc dant) OR (thuc vat)))) hanh vi cua te*.