Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
toc sach » hoc sach, doc sach, thuoc sach
tham soc » cham soc, tham nuoc, thai son
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
hanh ki » hanh vi, hanh ky, hanh kien
tu sach » thu sach, te sach, tu cach
soc va » hoc va, loc va, doc 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: ((((tu sach) or (su sach))) or (toc sach)) ky lang xa hoi. hieu va tham soc va hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (su sach))) OR (toc sach)) ky lang xa hoi. hieu va tham soc va hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (su sach))) or (toc sach)) ky lang xa hoi. hieu va tham soc va hanh ki su triet*.