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
thuc va » thuc vat, thuc dan, thuc day
hanh va » hang va, hanh vi
tuc va » truc va, tuc xa, duc va
va cua » va chua, via cua, ca cua
va hai » van hai, va chai, va khai

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 hai ((tuc va) OR (thuc va)) hanh va 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 hai ((tuc va) OR (thuc va)) hanh va 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 hai ((tuc va) OR (thuc va)) hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (dang xay)) hoi. hieu va hai ((tuc va) OR (thuc va)) hanh va cua triet*.