Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh san
thanh hoa » thanh pho
cau theo » cau thi, cau tao
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa

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 ty nang x ho. hieu ve cac tuc va ((thanh hai) OR (thanh hoa)) ((cua tre) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x ho. hieu ve cac tuc va ((thanh hai) OR (thanh hoa)) ((cua tre) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x ho. hieu ve cac tuc va ((thanh hai) OR (thanh hoa)) ((cua tre) or (cau theo))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x ho. hieu ve cac tuc va ((thanh hai) OR (thanh hoa)) ((cua tre) or (cau theo))*.