Perhaps you should try some spelling variations:
ve triet » va trien, su triet
sach thu » sach thue, sach thieu, sach tham
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
sach tu » cach tu, sach ty, sach uu
hieu ve » hieu van
nano xa » nano va, nano bac, nano cau
xuc va » duc va, tuc va, luc va
kem 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 tu) OR (sach thu)) nano xa hoi. ((hieu ve) or (hieu va)) cam xuc va hanh kem ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach thu)) nano xa hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh kem ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) OR (sach thu)) nano xa hoi. ((hieu ve) or (hieu va)) cam xuc va hanh kem ve triet*".