Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
va hanh » van hanh, va thanh, va danh
cac toc » cac toi, cac nuoc, cac thoi
tu sach » thu sach, su sach, te sach
cac tuc » cac tu, cac tac, cac nuoc
hieu ve » hieu va, hieu van
hanh xa » hanh va, hanh ma, hanh xu
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) or (cac toc)) va hanh ((nam 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) OR (cac toc)) va hanh ((nam va) OR (lam ha)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh xa hoi. hieu ve ((cac tuc) or (cac toc)) va hanh ((nam va) or (lam ha)) triet*.