Perhaps you should try some spelling variations:
thanh hoa » thanh pho
thanh tai » thanh hai, thanh toan, doanh tai
phan duc » phan tu, phan dau, tran duc
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
cao hoa » cao hoat, cao khoa, cau hoa
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang cao hoa. hieu va ((phan duc) OR (pham duc)) va ((thanh hoa) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang cao hoa. hieu va ((phan duc) OR (pham duc)) va ((thanh hoa) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang cao hoa. hieu va ((phan duc) OR (pham duc)) va ((thanh hoa) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang cao hoa. hieu va ((phan duc) OR (pham duc)) va ((thanh hoa) or (thanh tai)) cua tre*.