Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam
duc ca » duc cac, duc va, duc ha
ca dan » cac dan, ca dao
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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 ((ma hoi) or (xa hoi)). hieu ve cam duc ca dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ((ma hoi) OR (xa hoi)). hieu ve cam duc ca dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ((ma hoi) or (xa hoi)). hieu ve cam duc ca dan vi cua tre*.