Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, pham duc
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua

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 y ((lang xa) or (nang x)) hoi. ((hieu va) or (hieu van)) cam duc va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((lang xa) OR (nang x)) hoi. ((hieu va) OR (hieu van)) cam duc va hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((lang xa) or (nang x)) hoi. ((hieu va) or (hieu van)) cam duc va hanh vai cuu tre*.