Perhaps you should try some spelling variations:
thien van » thi van
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
van hac » van hoc, van ha, van hai
hac tac » cac tac, hoc tach, thac cac
lap cua » lai cua, lam cua, ap cua
tap cua » tap quan, tiep cua
x hoi » xa hoi, o hoi, x ho
gia » giao

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 (thu sach)) ky nang x hoi. thien van hac tac gia thanh ((lap cua) OR (tap cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. thien van hac tac gia thanh ((lap cua) OR (tap cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x hoi. thien van hac tac gia thanh ((lap cua) OR (tap cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang x hoi. thien van hac tac gia thanh ((lap cua) OR (tap cua)) triet*.