Perhaps you should try some spelling variations:
hanh dai » hanh dao, vanh dai, thanh dat
hanh tai » thanh tai, hang tai, han tai
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
bao duc » dao duc, bao luc, cao duc
ve bao » te bao, va bao
sai ky » sac ky
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: thu ((sach ty) or (sai ky)) nang xa hoi. hieu ve bao duc va ((hanh dai) OR (hanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sai ky)) nang xa hoi. hieu ve bao duc va ((hanh dai) OR (hanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) or (sai ky)) nang xa hoi. hieu ve bao duc va ((hanh dai) OR (hanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) or (sai ky)) nang xa hoi. hieu ve bao duc va ((hanh dai) OR (hanh tai)) cua te*.