Perhaps you should try some spelling variations:
duc manh » suc manh, duc anh, duc minh
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc phan
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve cao » va cao, ve bao, ve cac
anh va » hanh va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ty) or (sac ky)) nang xa hoi. hieu ve cao ((duc van) or (duc manh)) anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ty) OR (sac ky)) nang xa hoi. hieu ve cao ((duc van) OR (duc manh)) anh va cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ty) or (sac ky)) nang xa hoi. hieu ve cao ((duc van) or (duc manh)) anh va cua tre*.