Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
hieu quan » lieu quan, thien quan, lien quan
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hang ca » hang va, nang cao, hang tai
cac xuc » cam xuc, cac nuoc, chat xuc
xuc gia » duc gia, luc gia, tuc gia
ca hoi » cau hoi, cua hoi, xa hoi
lap su » lap du, lap tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ly hang ca hoi. ((hieu quan) or (hieu qua)) cac xuc gia thanh lap su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly hang ca hoi. ((hieu quan) OR (hieu qua)) cac xuc gia thanh lap su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ly hang ca hoi. ((hieu quan) or (hieu qua)) cac xuc gia thanh lap su triet*.