Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
xa thanh » va thanh, ha thanh, ta thanh
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, tu cach
ty nang » ky nang, ty hang, ly nang
te sach » toc sach
ve cac » va cac, vien cac
vi su » va su, ve su, ki su
o hoi » co hoi, o hoc, o hai

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 (te sach)) ((ty nang) or (ty xang)) o hoi. hieu ve cac tuc xa thanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ((ty nang) OR (ty xang)) o hoi. hieu ve cac tuc xa thanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ((ty nang) or (ty xang)) o hoi. hieu ve cac tuc xa thanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ((ty nang) or (ty xang)) o hoi. hieu ve cac tuc xa thanh vi su triet*.