Perhaps you should try some spelling variations:
va triet » va thiet, va trien, 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 duc » pham duc, cham soc, pham duy
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
duc van » duc va, duc tan, duc manh
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
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 ty nang xa hoi. ((hieu ve) OR (hieu van)) cham duc van ((hanh lai) OR (hanh tai)) va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((hieu ve) OR (hieu van)) cham duc van ((hanh lai) or (hanh tai)) va triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((hieu ve) OR (hieu van)) cham duc van ((hanh lai) or (hanh tai)) va triet*.