Perhaps you should try some spelling variations:
thanh le » thinh le, thanh ve, thanh de
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
luc ban » duc ban, luc bat, luc van
cuc ban » cua ban, cac ban, cuu ban
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
le va » le van, te va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ty) or (sac ky)) nang ma hoi. hieu va cam ((luc ban) or (cuc ban)) thanh le va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ty) OR (sac ky)) nang ma hoi. hieu va cam ((luc ban) OR (cuc ban)) thanh le va triet.
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ty) or (sac ky)) nang ma hoi. hieu va cam ((luc ban) or (cuc ban)) thanh le va triet*.