Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
dang ha » dong ha, dung ha, lang ha
hieu va » lieu va, hieu qua
sach ky » sac ky, sach ty, sach kem
vi cua » vai cua, di cua
loc va » luc va
va cam » va cham, va cac, va cao
ha hoi » hoa hoi, ha noi, xa hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) OR (sach y)) dang ha hoi. hieu va cam ((loc va) or (hoc va)) thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach y)) dang ha hoi. hieu va cam ((loc va) OR (hoc va)) thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sach y)) dang ha hoi. hieu va cam ((loc va) or (hoc va)) thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) OR (sach y)) dang ha hoi. hieu va cam ((loc va) or (hoc va)) thanh vi cua te*.