Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van khang » van khanh, van thanh, van quang
cham duc » pham duc, cham soc, pham duy
khang di » hang di, khang vi, khang voi
cua tre » cua te, cuu tre, dua tren
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cham » va cham, ve chat, vu cham

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) or (thu hoach)) ky lang xa hoi. hieu ve cham duc van khang di ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky lang xa hoi. hieu ve cham duc van khang di ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky lang xa hoi. hieu ve cham duc van khang di ((cua tre) or (cua triet))*.