Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
cao suc » cao su, cao duc
hieu va » lieu va, hieu qua
cao xuc » cam xuc, cao duc, chat xuc
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ve cua » le cua, de cua, te cua

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 y ((lang xa) or (nang x)) hoi. hieu va ((cao xuc) OR (cao suc)) va hanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang xa) OR (nang x)) hoi. hieu va ((cao xuc) OR (cao suc)) va hanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((lang xa) or (nang x)) hoi. hieu va ((cao xuc) OR (cao suc)) va hanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) or (nang x)) hoi. hieu va ((cao xuc) OR (cao suc)) va hanh ve cua tre*.