Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
hang dau » hang va, hang tai
va hang » van hang, va nang, va lang
hieu ve » hieu va, hieu van
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
ve cham » va cham, ve chat, vu cham
y tang » ky tang, 6 tang, 7 tang
soc va » hoc va, loc va, doc va
ma hoi » xa hoi, ma hoa, me hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y tang ((ma hoi) OR (mai hoi)). hieu ve cham soc va hang dau ((cua viet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y tang ((ma hoi) OR (mai hoi)). hieu ve cham soc va hang dau ((cua viet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: te sach y tang ((ma hoi) OR (mai hoi)). hieu ve cham soc va hang dau ((cua viet) OR (su triet))*.