Perhaps you should try some spelling variations:
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
cao suc » cao su, cao duc
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
ve cao » va cao, ve bao, ve cac
suc va » duc va, tuc va, luc va

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 cao suc va hanh vi ((cuu tre) OR (cua 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 cao suc va hanh vi ((cuu tre) OR (cua 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 cao suc va hanh vi ((cuu tre) OR (cua tre))*".