Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
cham sac » cham soc, pham sach, cap sac
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va
sac van » cac van, san van, sat van
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
tu sach » thu sach, su sach, te sach

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: tu sach tu nang xa hoi. ((hieu ve) OR (hieu van)) cham sac van ((hanh lai) OR (hanh tai)) su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang xa hoi. ((hieu ve) OR (hieu van)) cham sac van ((hanh lai) or (hanh tai)) su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang xa hoi. ((hieu ve) OR (hieu van)) cham sac van ((hanh lai) or (hanh tai)) su triet*.