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