Perhaps you should try some spelling variations:
thu nang » thi nang, thu hang, thu bang
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
su sach » so sach, vu sach
va chat » van chat, va phat, cao chat
tai cua » thai cua, tai cuc, tri cua
duc van » duc va, duc tan, duc manh
ve chat » van chat
va cam » va cham, va cac, va cao
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 thu nang x hoi. hieu ((va cam) or (((ve chat) or (va chat)))) duc van hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang x hoi. hieu ((va cam) OR (((ve chat) OR (va chat)))) duc van hanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach thu nang x hoi. hieu ((va cam) or (((ve chat) or (va chat)))) duc van hanh tai cua te*.