Perhaps you should try some spelling variations:
thien quan » trien quang, lien quan, thien van
cua viet » ca viet, hoa viet, cua vat
thanh de » hanh de, thanh ve, thanh do
thanh di » thanh doi, thanh do, thanh dinh
nam xuc » cam xuc, nam xua, nam thuc
so sach » so sanh, bo sach, co sach
hang ca » hang va, nang cao, hang tai
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
xuc va » duc va, tuc va, luc va
ca hoi » cau hoi, cua hoi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ly hang ca hoi. ((thien quan) or (hieu qua)) nam xuc va ((thanh di) OR (thanh de)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly hang ca hoi. ((thien quan) OR (hieu qua)) nam xuc va ((thanh di) OR (thanh de)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly hang ca hoi. ((thien quan) or (hieu qua)) nam xuc va ((thanh di) OR (thanh de)) cua viet".
• Adding a wildcard symbol may retrieve word variants: so sach ly hang ca hoi. ((thien quan) or (hieu qua)) nam xuc va ((thanh di) OR (thanh de)) cua viet*.