Perhaps you should try some spelling variations:
thu sang » thu hang, thu san, thu bang
thu dong » thuy dong, tu dong, thu cong
tan hanh » tan thanh, tang hanh, toan hanh
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
cua tre » cua te, cuu tre, cua triet
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 sang) or (thu dong)) xa hoi. hieu ve pham duc tan hanh vai ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thu sang) OR (thu dong)) xa hoi. hieu ve pham duc tan hanh vai ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: su sach ((thu sang) or (thu dong)) xa hoi. hieu ve pham duc tan hanh vai ((cua tre) or (cua tu))*.