Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan
hanh mai » hanh ma, hanh mau, hanh may
va triet » va thiet, va trien, ve triet
vu sach » vu bach, su sach, vu khach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
va nam » van nam, ha nam, va nay

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 y nang cao hoi. hieu va nam ((thuc dan) or (thuc vat)) hanh mai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang cao hoi. hieu va nam ((thuc dan) OR (thuc vat)) hanh mai va triet.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang cao hoi. hieu va nam ((thuc dan) or (thuc vat)) hanh mai va triet*.