Perhaps you should try some spelling variations:
thanh ha » thanh hoa, thanh hai, nhanh ha
sach ky » sach y, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
loc va » hoc va, luc va
ha cua » hoa cua, hai cua, nha cua
ve cac » va cac, vien cac

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

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