Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
tu sach » thu sach, su sach, te sach
dai huu » dao huu, dai hau, dai thua
cam duc » cam xuc, cao duc, nam duoc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
lang ha » long ha
lang xa » dang xay, lang van
huu tre » huu tri, cuu tre, huu them

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 ky ((lang xa) or (lang ha)) hoi. hieu va ((cam duc) or (pham duc)) van thanh dai huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (lang ha)) hoi. hieu va ((cam duc) OR (pham duc)) van thanh dai huu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (lang ha)) hoi. hieu va ((cam duc) or (pham duc)) van thanh dai huu tre*.