Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
hanh xa » hanh va, hanh ma, hanh xu
va hanh » va thanh, va danh, ban hanh
ve cac » va cac, vien cac
lam va » nam va, dam va, am va
lam ha » nam ha, dam ha, lam chat

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 thi hanh xa hoi. hieu ve cac tuc ((va hanh) OR (van hanh)) ((lam va) or (lam ha)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh xa hoi. hieu ve cac tuc ((va hanh) OR (van hanh)) ((lam va) OR (lam ha)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi hanh xa hoi. hieu ve cac tuc ((va hanh) OR (van hanh)) ((lam va) or (lam ha)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh xa hoi. hieu ve cac tuc ((va hanh) OR (van hanh)) ((lam va) or (lam ha)) triet*.