Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
va cam » va cham, va cao, va cai
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vai va, vu 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 tru nang x hoi. lieu ((va cam) OR (va cac)) xuc ((va thanh) or (van hanh)) vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tru nang x hoi. lieu ((va cam) OR (va cac)) xuc ((va thanh) OR (van hanh)) vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tru nang x hoi. lieu ((va cam) OR (va cac)) xuc ((va thanh) or (van hanh)) vi va triet".
• Adding a wildcard symbol may retrieve word variants: su sach tru nang x hoi. lieu ((va cam) OR (va cac)) xuc ((va thanh) or (van hanh)) vi va triet*.