Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
he van » le van, ho van, ha van
ve cac » va cac, vien cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach ty)) nang xa hoi. hieu ve cac he van ((hanh tai) OR (hang tai)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) OR (sach ty)) nang xa hoi. hieu ve cac he van ((hanh tai) or (hang tai)) cua viet~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) OR (sach ty)) nang xa hoi. hieu ve cac he van ((hanh tai) or (hang tai)) cua viet*.