Perhaps you should try some spelling variations:
thanh vinh » thanh binh, thanh tinh, than kinh
hieu van » thien van, lieu va, hieu ve
vinh cuu » dinh cuu, sinh cua, dinh cu
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
lam tuc » lam thuoc, lam truoc, luat tuc
tuc gia » tac gia, duc gia, toc gia
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
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)) y nang x hoi. ((hieu van) or (hieu va)) lam tuc gia thanh vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang x hoi. ((hieu van) OR (hieu va)) lam tuc gia thanh vinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y nang x hoi. ((hieu van) or (hieu va)) lam tuc gia thanh vinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) y nang x hoi. ((hieu van) or (hieu va)) lam tuc gia thanh vinh cuu tre*.