Perhaps you should try some spelling variations:
xa thanh » va thanh, ha thanh, ta thanh
thanh va » thanh van, hanh va, thanh ha
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
su viet » so viet
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
tac xa » tuc xa, tac da
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 (thu hoach)) ty nang o hoi. hieu ve cac tac xa thanh va su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ty nang o hoi. hieu ve cac tac xa thanh va su viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ty nang o hoi. hieu ve cac tac xa thanh va su viet*.