Perhaps you should try some spelling variations:
thien van » thi van
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
toc van » hoc van, toc san, tac van
cac toc » cac toi, cac nuoc, cac thoi
van cac » van hac, van cau, van bac
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
cuu tre » cau tren, cau treo

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 ((ly nang) or (ly hang)) xa hoi. thien van cac toc van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ly hang)) xa hoi. thien van cac toc van hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ly hang)) xa hoi. thien van cac toc van hanh vi ((cua tre) or (cuu tre))*.