Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
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 tai » thanh tai, hang tai, han tai
van pham » san pham, van phan, van phat
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
duc van » duc va, duc tan, duc manh
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 van pham duc van hanh tai ((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 van pham duc van hanh tai ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: su sach ((thu dang) or (thu dong)) xa hoi. hieu van pham duc van hanh tai ((cua tre) or (cua tu))*.