Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
vuc van » duc van, luc van, thuc van
cam vuc » cam xuc
hieu ve » hieu va, hieu van
lai roi » lai hoi, loi roi
ty hang » ly hang, thi hang, thu hang
ty mang » tin mang, tri mang, cay mang
su tien » su kien, su hien, tu tieng
ve cam » ve cham, ve cac, va cam

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 ((((ty mang) OR (ty xang))) or (ty hang)) lai roi. hieu ve cam vuc van hanh lai su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((ty mang) OR (ty xang))) OR (ty hang)) lai roi. hieu ve cam vuc van hanh lai su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((((ty mang) OR (ty xang))) or (ty hang)) lai roi. hieu ve cam vuc van hanh lai su tien".
• Adding a wildcard symbol may retrieve word variants: su sach ((((ty mang) OR (ty xang))) or (ty hang)) lai roi. hieu ve cam vuc van hanh lai su tien*.