Perhaps you should try some spelling variations:
thien van » thi van
ve triet » va trien, su triet
vanh dai » van dai, vanh tai, van dao
cau tuc » cau truc, cau tu, cau luc
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
van cau » van dau, van hau, van chat
tuc va » thuc va, truc va, tuc xa

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 ty nang ((ma hoa) or (xa hoi)). thien van cau tuc va ((vanh dai) OR (lanh dao)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((ma hoa) OR (xa hoi)). thien van cau tuc va ((vanh dai) OR (lanh dao)) ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((ma hoa) or (xa hoi)). thien van cau tuc va ((vanh dai) OR (lanh dao)) ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((ma hoa) or (xa hoi)). thien van cau tuc va ((vanh dai) OR (lanh dao)) ve triet*.