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
tuc van » thuc van, truc van, tuc va
tu sach » thu sach, su sach, te sach
hanh xa » hanh va, hanh ma, hanh xu
va cham » va chat, va tham
ve cam » ve cham, ve cac, va cam
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 cam) or (va cham)) tuc 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 cam) OR (va cham)) tuc 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 cam) or (va cham)) tuc van hanh ((lam va) OR (lam ha)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh xa hoi. hieu ((ve cam) or (va cham)) tuc van hanh ((lam va) OR (lam ha)) triet*.