Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
va tham » van tham, va cham, va thanh
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
cau tre » cau tren, cau treo, cau tra
loc va » hoc va, luc va
va cau » van cau, va cac, va dau

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 hang) or (ly hang)) cau hoi. hieu ((va tham) or (ve chat)) loc va hanh va cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ly hang)) cau hoi. hieu ((va tham) OR (ve chat)) loc va hanh va cau tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (ly hang)) cau hoi. hieu ((va tham) or (ve chat)) loc va hanh va cau tre*.