Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
dao cua » dai cua, day cua, dan cua
cua tre » cua te, cuu tre, cua triet
va dat » va dao, va dau, va dap
x hoi » xa hoi, o hoi, 5 hoi
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang ((x hoi) OR (x ho)). hieu va dat nuoc va van dao cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang ((x hoi) OR (x ho)). hieu va dat nuoc va van dao cua tre*".