Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu van » thien van, lieu va, hieu ve
su sach » so sach, vu sach
cau duc » cau luc, chu duc, cau truc
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
cuu tre » cua tre, cau tren, cau treo
sach lo » sach dao, sach doi, sach hoi
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
lo lang » o lang, so lang, le lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach lo lang xa hoi. ((hieu van) or (hieu va)) ((cau duc) or (cao duc)) va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach lo lang xa hoi. ((hieu van) OR (hieu va)) ((cau duc) OR (cao duc)) va hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach lo lang xa hoi. ((hieu van) or (hieu va)) ((cau duc) or (cao duc)) va hanh vai cuu tre*.