Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
dau thi » cau thi, dan thi, dao thi
thi cuu » thi cuc, thi huu, thi cu
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, ma hoa, me hoi
dac va » duc va, dat va, dai va

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

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