Perhaps you should try some spelling variations:
thanh nam » hanh nam, thanh tam, thanh pham
thanh van » thanh san, thanh toan, thanh phan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cuc ban » cua ban, cac ban, cuu ban
luc ban » duc ban, luc bat, luc van
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
va cau » van cau, va cac, va dau
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 sang ma hoi. hieu va cau ((luc ban) OR (cuc ban)) ((thanh van) or (thanh nam)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoi. hieu va cau ((luc ban) OR (cuc ban)) ((thanh van) OR (thanh nam)) cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ma hoi. hieu va cau ((luc ban) OR (cuc ban)) ((thanh van) or (thanh nam)) cua tu*".