Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
hanh doi » thanh doi, hanh noi, hang doi
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
doi va » hoi va, noi va, dai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((xa hoi) or (x ho)). hieu ve ((cham soc) or (pham duc)) va hanh doi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((xa hoi) OR (x ho)). hieu ve ((cham soc) OR (pham duc)) va hanh doi va trien.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((xa hoi) or (x ho)). hieu ve ((cham soc) or (pham duc)) va hanh doi va trien*.