Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
thu sach » tu sach, thuat sach, thuoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hang ca » hang va, nang cao, hang tai
tuc va » thuc va, truc va, duc va
ca cua » co cua
va hac » van hac, va khac, va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang xa) or (dang xay)) hoi. hieu va hac ((tuc va) OR (tuc xa)) hang ca cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (dang xay)) hoi. hieu va hac ((tuc va) OR (tuc xa)) hang ca cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) or (dang xay)) hoi. hieu va hac ((tuc va) OR (tuc xa)) hang ca cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (dang xay)) hoi. hieu va hac ((tuc va) OR (tuc xa)) hang ca cua triet*.