Perhaps you should try some spelling variations:
tai khoa » da khoa, noi khoa
thu sach » thuat sach, thuoc sach, thu hoach
hanh vai » hanh vi, hanh va, hanh tai
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc 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) or (thu sach)) ky nang ((mai hoi) or (tai khoa)). hieu ve cam xuc va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ((mai hoi) OR (tai khoa)). hieu ve cam xuc va hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ((mai hoi) or (tai khoa)). hieu ve cam xuc va hanh vai cuu tre*.