Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va
cao suc » cao su, cao duc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
suc va » duc va, tuc va, luc va
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: su ((sach y) or (sach tu)) nang x ho. ((hieu ve) OR (hieu van)) cao suc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sach tu)) nang x ho. ((hieu ve) OR (hieu van)) cao suc va hanh vi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (sach tu)) nang x ho. ((hieu ve) OR (hieu van)) cao suc va hanh vi cuu tre*".