Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh sai » dung sai, danh bat, danh dau
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo
thu xac » thau xay
so sach » so sanh, bo sach, co sach
hieu he » hieu ve, hiem he, hieu le
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
he nam » ha nam, nghe nam
ma hoi » mai hoi, xa hoi, ma hoa
thu xa » thu ha, thu xe, thu ba

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang ma hoi. hieu he nam ((thu xa) or (thu xac)) danh sai ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang ma hoi. hieu he nam ((thu xa) OR (thu xac)) danh sai ((cuu tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: so sach ty nang ma hoi. hieu he nam ((thu xa) or (thu xac)) danh sai ((cuu tre) or (cua triet))*.