Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh ve » hanh vi, hanh va, hanh kem
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
ve ve » de ve, va ve, ke ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang xa) or (sang ma)) hoi. hieu ve cam ((xuc va) OR (tuc va)) hanh ve ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (sang ma)) hoi. hieu ve cam ((xuc va) OR (tuc va)) hanh ve ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (sang ma)) hoi. hieu ve cam ((xuc va) OR (tuc va)) hanh ve ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (sang ma)) hoi. hieu ve cam ((xuc va) OR (tuc va)) hanh ve ve triet*.