Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thi hanh » thi thanh
su triet » su viet, su tien, ve triet
xay hoi » tay hoi, cay phoi, gay thoi
thi van » thi lan, thi nang
nam sua » nam cua, nam suu, nam mua
va hanh » van hanh, va thanh, va danh
hanh ki » hanh vi, hanh ky, hanh kien
sach o » sach lo, sac o, sach y
o dang » xo dang, do dang, so dang
sua va » suat va, vua va, xua va
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach o dang ((xay hoi) or (xa hoi)). ((thi van) or (thi hanh)) nam sua va hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach o dang ((xay hoi) OR (xa hoi)). ((thi van) OR (thi hanh)) nam sua va hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: thuoc sach o dang ((xay hoi) or (xa hoi)). ((thi van) or (thi hanh)) nam sua va hanh ki su triet*.