Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
co sach » bo sach, cuon sach, hoc sach
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
ve cham » va cham, vu cham, ve chim
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ((ty nang) or (ty hang)) ma hoa. hieu ((ve cham) OR (ve chat)) duc va hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((ty nang) OR (ty hang)) ma hoa. hieu ((ve cham) OR (ve chat)) duc va hanh tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ((ty nang) or (ty hang)) ma hoa. hieu ((ve cham) OR (ve chat)) duc va hanh tai cua tu".
• Adding a wildcard symbol may retrieve word variants: co sach ((ty nang) or (ty hang)) ma hoa. hieu ((ve cham) OR (ve chat)) duc va hanh tai cua tu*.