Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
lang xa » lang ha, lang van
van coc » van hoc, van loc, van co
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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 y ((lang xa) or (dang xay)) hoi. hieu van coc luc va hanh trinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((lang xa) OR (dang xay)) hoi. hieu van coc luc va hanh trinh cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((lang xa) or (dang xay)) hoi. hieu van coc luc va hanh trinh cua tre*.