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
thu sai » thu hai, thu tai, thu san
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
luan va » luan van, luat va
va hanh » van hanh, va thanh, va danh
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 ((ky lang) OR (ky tang)) xa hoi. hieu phan dat luan va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sai ((ky lang) OR (ky tang)) xa hoi. hieu phan dat luan va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sai ((ky lang) OR (ky tang)) xa hoi. hieu phan dat luan va hanh vi cua tre*.