Perhaps you should try some spelling variations:
thanh dam » thanh nam, thanh tam, thanh lam
thanh dat » thanh san, thanh hai, thanh van
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
luc ban » duc ban, cuc ban, luc bat
cau luc » cau truc, cau phuc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
va cau » van cau, va cac, va dau
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua 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 ky nang ma hoi. hieu va cau luc ban ((thanh dat) or (thanh dam)) ((cua tu) OR (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu va cau luc ban ((thanh dat) OR (thanh dam)) ((cua tu) OR (cua cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu va cau luc ban ((thanh dat) or (thanh dam)) ((cua tu) OR (cua cu))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu va cau luc ban ((thanh dat) or (thanh dam)) ((cua tu) OR (cua cu))*.