Perhaps you should try some spelling variations:
khach ly » khanh ly, khich le
hanh dai » hanh tai, hanh dao, vanh dai
khao ly » khanh ly
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet

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

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