Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
lang tai » lang thai, hang tai, tang tai
tai khoa » da khoa, noi khoa
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
cuu tre » cua tre, cau tren, cau treo

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 _ lang tai khoa. ((hieu ve) or (hieu van)) pham duc va thanh tai ((cuu tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach _ lang tai khoa. ((hieu ve) OR (hieu van)) pham duc va thanh tai ((cuu tre) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach _ lang tai khoa. ((hieu ve) or (hieu van)) pham duc va thanh tai ((cuu tre) or (dau tren))*.