Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
duc phan » dung phan, duc thang, duc phung
hanh lam » thanh lap, hanh kem, hanh va
va triet » va thiet, va trien, ve triet
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
van hoi » van hoa, van hoc, van hoe
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
lam va » nam va, dam va, lam ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ky lang) OR (ky tang)) van hoi. hieu va cam ((duc phan) or (duc tan)) hanh lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky tang)) van hoi. hieu va cam ((duc phan) OR (duc tan)) hanh lam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) OR (ky tang)) van hoi. hieu va cam ((duc phan) or (duc tan)) hanh lam va triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) OR (ky tang)) van hoi. hieu va cam ((duc phan) or (duc tan)) hanh lam va triet*.