Perhaps you should try some spelling variations:
thien van » thi van
hanh dai » hanh tai, hanh dao, vanh dai
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
sac ky » cac ky, sai ky
cua te » cua tu
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sac ky)) nang xa hoi. thien van cau ((tran van) OR (luan van)) hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) nang xa hoi. thien van cau ((tran van) OR (luan van)) hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sac ky)) nang xa hoi. thien van cau ((tran van) OR (luan van)) hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) nang xa hoi. thien van cau ((tran van) OR (luan van)) hanh dai cua te*.