Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
qua cai » qua hai, qua cac, qua ca
qua cao » qua cac, qua ca, qua co
sach ky » sac ky, sach y, sach ty
nang ra » nang ma, lang ra, nang va
nang ro » nang co, nang ho, nang rong
cua te » cua tu

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 ky ((nang ro) or (nang ra)) hoi. hieu ((qua cao) OR (qua cai)) duc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang ro) OR (nang ra)) hoi. hieu ((qua cao) OR (qua cai)) duc va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang ro) or (nang ra)) hoi. hieu ((qua cao) OR (qua cai)) duc va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ro) or (nang ra)) hoi. hieu ((qua cao) OR (qua cai)) duc va hanh vai cua te*.