Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu dang » thu hang, thu bang, thu sang
thu dong » thuy dong, tu dong, thu cong
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
ve pham » vi pham, v pham, ve phan
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((thu dang) OR (thu dong)) xa hoi. hieu ve pham duc van hanh vai ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thu dang) OR (thu dong)) xa hoi. hieu ve pham duc van hanh vai ((cua tre) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((thu dang) OR (thu dong)) xa hoi. hieu ve pham duc van hanh vai ((cua tre) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: su sach ((thu dang) OR (thu dong)) xa hoi. hieu ve pham duc van hanh vai ((cua tre) or (cua tu))*.