Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, dieu khien
thien hach » thien thanh, hien hanh
luan phan » luan van, luan hoan
hach xuc » thach duc, hanh xu, cach xu
va trinh » van trinh, va tinh, lap trinh
van phan » van phong, van thanh, van ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
xuc va » duc va, tuc va, luc va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x hoi. hieu thien hach xuc va trinh ((van phan) OR (luan phan)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu thien hach xuc va trinh ((van phan) OR (luan phan)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu thien hach xuc va trinh ((van phan) OR (luan phan)) tre*.