Perhaps you should try some spelling variations:
thuc van » thuc dan, thuc va, thuc hanh
hang don » hang ton, hang doi, dang don
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
hieu va » lieu va
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
don su » dong su, down su, dan su
x hoi » xa hoi, o hoi, x ho

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 x hoi. ((hieu va) or (hieu qua)) cac ((thuc van) OR (thuc vat)) hang don su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang x hoi. ((hieu va) OR (hieu qua)) cac ((thuc van) OR (thuc vat)) hang don su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang x hoi. ((hieu va) or (hieu qua)) cac ((thuc van) OR (thuc vat)) hang don su triet".
• Adding a wildcard symbol may retrieve word variants: su sach v nang x hoi. ((hieu va) or (hieu qua)) cac ((thuc van) OR (thuc vat)) hang don su triet*.