Perhaps you should try some spelling variations:
nang doi » hang doi, nang dong, nhung doi
nang doc » nang luc
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. hieu va cac tuc xa ((((nang doi) or (nang doc))) or (nang noi)) va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu va cac tuc xa ((((nang doi) OR (nang doc))) OR (nang noi)) va trien.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu va cac tuc xa ((((nang doi) or (nang doc))) or (nang noi)) va trien*.