Perhaps you should try some spelling variations:
thanh hoa » thanh pho
su triet » su viet, su tien, ve triet
thu sach » thuat sach, thuoc sach, thu hoach
thanh ha » thanh hai, nhanh ha, thanh phan
cac tac » cac toc, cac bac, cac dac
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
tac xa » tuc xa, tac da
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
o hoc » co hoc, mo hoc, so hoc

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