Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
sach ty » sach y, sach tu, sach thu
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
te sach » toc sach
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho
su va » su van, tu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang x hoi. hieu ((ve cam) or (va cam)) xuc ((va dinh) OR (va tinh)) su va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu ((ve cam) OR (va cam)) xuc ((va dinh) OR (va tinh)) su va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x hoi. hieu ((ve cam) or (va cam)) xuc ((va dinh) OR (va tinh)) su va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu ((ve cam) or (va cam)) xuc ((va dinh) OR (va tinh)) su va triet*.