Perhaps you should try some spelling variations:
hieu hieu » hien hieu, hieu hien, thien hieu
hieu cac » hieu luc, hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
te sach » toc sach
cac ly » cac ky, cac le, cam ly
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
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: ((su sach) or (te sach)) ky nang xa hoi. hieu hieu cac ly ((va dan) OR (ca dan)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang xa hoi. hieu hieu cac ly ((va dan) OR (ca dan)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky nang xa hoi. hieu hieu cac ly ((va dan) OR (ca dan)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang xa hoi. hieu hieu cac ly ((va dan) OR (ca dan)) vai cua te*.