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

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