Perhaps you should try some spelling variations:
van khang » van khanh, van thanh, van quang
su triet » su viet, su tien, ve triet
khang di » hang di, khang vi, khang voi
truc van » truc va, thuc van, truc ban
vien dai » hien dai
sach van » sach han, sach va, bach van
vien cac » vien bach, vien da, gian cac
nang xa » lang xa, nang ma, mang xa
su sach » so sach, vu sach
di su » doi su, ki su, da 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 van ((nang xa) OR (nang x)) hoi. hieu ((vien cac) or (vien dai)) truc van khang di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van ((nang xa) OR (nang x)) hoi. hieu ((vien cac) OR (vien dai)) truc van khang di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach van ((nang xa) OR (nang x)) hoi. hieu ((vien cac) or (vien dai)) truc van khang di su triet".
• Adding a wildcard symbol may retrieve word variants: su sach van ((nang xa) OR (nang x)) hoi. hieu ((vien cac) or (vien dai)) truc van khang di su triet*.