Perhaps you should try some spelling variations:
hieu phan » phieu phan, lieu phan, hieu pham
phan dat » phan dau, phan dai, phan day
dat luan » dan luan, dau luan, dat quang
van hanh » van thanh, ban hanh, van anh
thu sai » thu hai, thu san, thu ai
thu tai » tu tai, tru tai, thu hai
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
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: ((thu sai) or (thu tai)) ky lang xa hoi. hieu phan dat luan van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sai) OR (thu tai)) ky lang xa hoi. hieu phan dat luan van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sai) or (thu tai)) ky lang xa hoi. hieu phan dat luan van hanh vi cua tre*.