Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
thanh dam » thanh nam, thanh tam, thanh lam
tu sach » thu sach, su sach, te sach
luc ban » duc ban, cuc ban, luc bat
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
nang ma » tang ma, sang ma, nang cao
va cau » va cac, va dau, va cao
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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 ky nang ma hoi. hieu ((va cau) OR (van cau)) luc ban ((thanh dat) or (thanh dam)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ((va cau) OR (van cau)) luc ban ((thanh dat) OR (thanh dam)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu ((va cau) OR (van cau)) luc ban ((thanh dat) or (thanh dam)) cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ((va cau) OR (van cau)) luc ban ((thanh dat) or (thanh dam)) cua tu*.