Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
sach thu » sach thue, sach thieu, sach tham
cac truc » cau truc, cac tru, cac trung
truc gia » truc giac, tuc gia, thuc giai
gia hanh » gia thanh, giao hanh, gia anh
su triet » su viet, su tien, ve triet
hieu ve » hieu va, hieu van
xang o » lang o, tang o, dang o
ve cac » va cac, vien cac
o hoc » co hoc, mo hoc, so hoc
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo ((sach thu) or (cach thuc)) xang o hoc. hieu ve cac truc gia hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo ((sach thu) OR (cach thuc)) xang o hoc. hieu ve cac truc gia hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: bo ((sach thu) or (cach thuc)) xang o hoc. hieu ve cac truc gia hanh vi su triet*.