Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va thanh, va danh
lua tre » cua tre, luy tre, dua tren
ve cao » ve cac, ve co, vu cao
va cao » va cac, va co, va dao
ve bao » te bao, va bao
vi lua » vi luu
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu ((((ve cao) OR (va cao))) or (ve bao)) duc va hanh vi lua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu ((((ve cao) OR (va cao))) OR (ve bao)) duc va hanh vi lua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu ((((ve cao) OR (va cao))) or (ve bao)) duc va hanh vi lua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu ((((ve cao) OR (va cao))) or (ve bao)) duc va hanh vi lua tre*.