Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
va triet » va thiet, va trien, ve triet
te sach » toc sach
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, va tinh
y nang » ky nang, ly nang, v nang
x hoi » o hoi, x ho, 5 hoi
va am » va lam, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ((x hoi) or (xa hoi)). hieu va am thuc ((va dinh) or (va thanh)) mai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((x hoi) OR (xa hoi)). hieu va am thuc ((va dinh) OR (va thanh)) mai va triet.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((x hoi) or (xa hoi)). hieu va am thuc ((va dinh) or (va thanh)) mai va triet*.