Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
su sach » so sach, vu sach
tai cua » thai cua, tai cuc, tri cua
han tai » hang tai, nhan tai, van tai
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
nang xa » nang x, nang ma, mang xa
va han » va phan, van han, va hanh
cua su » qua su

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 ky ((nang xa) or (((lang xa) OR (dang xay)))) hoi. hieu van cau duc va han tai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (((lang xa) OR (dang xay)))) hoi. hieu van cau duc va han tai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (((lang xa) OR (dang xay)))) hoi. hieu van cau duc va han tai cua su".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (((lang xa) OR (dang xay)))) hoi. hieu van cau duc va han tai cua su*.