Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
nang ra » nang ma, lang ra, nang ro
ve chat » va chat, van chat
su sach » so sach, vu sach
ve cham » va cham, vu cham, ve chim
ra hoi » ra khoi, xa hoi, va hoi
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (su sach)) ky nang ra hoi. hieu ((ve cham) OR (ve chat)) duc va thanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (su sach)) ky nang ra hoi. hieu ((ve cham) OR (ve chat)) duc va thanh di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (su sach)) ky nang ra hoi. hieu ((ve cham) OR (ve chat)) duc va thanh di su triet".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (su sach)) ky nang ra hoi. hieu ((ve cham) OR (ve chat)) duc va thanh di su triet*.