Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh sai » dung sai, danh bat, danh dau
cua tre » cua te, cuu tre, dua tren
xa danh » va danh, dia danh, nam danh
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
hieu he » hieu ve, hiem he, hieu le
he nam » ha nam, nghe nam
thu xa » thu xac, thu ha, thu xe
ma hoi » xa hoi, ma hoa, me hoi

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 ty nang ((ma hoi) or (mai hoi)). hieu he nam thu xa danh sai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((ma hoi) OR (mai hoi)). hieu he nam thu xa danh sai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((ma hoi) or (mai hoi)). hieu he nam thu xa danh sai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((ma hoi) or (mai hoi)). hieu he nam thu xa danh sai ((cua tre) OR (cua triet))*.