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