Perhaps you should try some spelling variations:
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
hieu ha » hieu hoa, hieu va, hieu ca
nam qua » nam quan, nam cua, nam mua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
qua va » quan va, qua van, vua va
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ty nang x hoi. hieu ha nam qua va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang x hoi. hieu ha nam qua va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang x hoi. hieu ha nam qua va hanh vi cua tre*.