Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
nang ho » nang hoc, nang co, tang ho
van cac » van hac, van cau, van bac
xuc ban » duc ban, cuc ban, quoc ban
y nang » ky nang, ly nang, v nang
ho hai » hoc hai, pho hai, cho hai
tai su » tai so, tai tu, lai su

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 y nang ho hai. hieu van cac ((xuc ban) or (duc va)) hanh tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ho hai. hieu van cac ((xuc ban) OR (duc va)) hanh tai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ho hai. hieu van cac ((xuc ban) or (duc va)) hanh tai su triet*.