Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
khang di » hang di, khang vi, khang voi
truc van » thuc van, truc ban, truc dan
vien dai » hien dai
vien cac » vien bach, vien da, gian cac
truc va » thuc va, thuc vat, trung va
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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 v nang xa hoi. hieu ((vien cac) or (vien dai)) ((truc van) OR (truc va)) khang di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. hieu ((vien cac) OR (vien dai)) ((truc van) OR (truc va)) khang di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. hieu ((vien cac) or (vien dai)) ((truc van) OR (truc va)) khang di su triet".
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. hieu ((vien cac) or (vien dai)) ((truc van) OR (truc va)) khang di su triet*.