Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
tuan hoi » tan hoi, quang hoi, tuan hoan
cua viet » ca viet, hoa viet, cua vat
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va tuan » van tuan, va quan, va toan
cua tre » cua te, cuu tre, cua triet
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ((ky lang) OR (ky nang)) xa hoi. hieu ve cham duc va tuan hoi ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ((ky lang) OR (ky nang)) xa hoi. hieu ve cham duc va tuan hoi ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ((ky lang) OR (ky nang)) xa hoi. hieu ve cham duc va tuan hoi ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su cac ((ky lang) OR (ky nang)) xa hoi. hieu ve cham duc va tuan hoi ((cua tre) or (cua viet))*.