Perhaps you should try some spelling variations:
xa thanh » va thanh, ha thanh, ta thanh
hieu ve » hieu va, hieu van
su sach » so sach
vu sach » vu bach, vu khach
cac tac » cac toc, cac bac, cac dac
ve cac » va cac, vien cac
tac xa » tuc xa, tac da
x hoi » xa hoi, o hoi, x ho
vi su » va su, ve su, oi su
ki su » ky su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ky nang x hoi. hieu ve cac tac xa thanh ((vi su) OR (ki su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang x hoi. hieu ve cac tac xa thanh ((vi su) OR (ki su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky nang x hoi. hieu ve cac tac xa thanh ((vi su) OR (ki su)) triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang x hoi. hieu ve cac tac xa thanh ((vi su) OR (ki su)) triet*.