Perhaps you should try some spelling variations:
xa thanh » va thanh, ha thanh, ta thanh
thanh vi » hanh vi, thanh va, thanh ve
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
vi su » va su, ve su, ki 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 ty nang o hoi. ((hieu ve) OR (hieu va)) cac tuc xa thanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang o hoi. ((hieu ve) OR (hieu va)) cac tuc xa thanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoi. ((hieu ve) OR (hieu va)) cac tuc xa thanh vi su triet*.