Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
sach ky » sach y, sach ty, sach kem
duc gia » quoc gia
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
lang ha » long ha
lang xa » dang xay, lang van
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sac ky)) ((lang xa) OR (lang ha)) hoi. hieu ve cac duc gia thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) ((lang xa) OR (lang ha)) hoi. hieu ve cac duc gia thanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) ((lang xa) OR (lang ha)) hoi. hieu ve cac duc gia thanh vi cua tre*".