Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh tai, hanh van
su sach » so sach, vu sach
hanh va » hang va, hanh vi
xua van » xua va, qua van, cua van
dau xua » dau cua, dao xuan, dau luan
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
ma hoi » xa hoi, ma hoa, me hoi
va dau » va dao

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 nang ((ma hoi) OR (mai hoi)). lieu va dau xua van ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((ma hoi) OR (mai hoi)). lieu va dau xua van ((hanh vai) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((ma hoi) OR (mai hoi)). lieu va dau xua van ((hanh vai) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((ma hoi) OR (mai hoi)). lieu va dau xua van ((hanh vai) or (hanh va)) cua tre*.