Perhaps you should try some spelling variations:
hieu cao » chieu cao, hieu cac, hieu ca
chat soc » cham soc, chat hoc, chat doc
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
dan dai » dat dai, can dai, dan dat
soc va » hoc va, loc va, doc va
va dan » ca dan, va dao, va dau

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 ((ky lang) or (ky nang)) xa hoi. hieu cao chat soc va dan dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu cao chat soc va dan dai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. hieu cao chat soc va dan dai cua viet*.