Perhaps you should try some spelling variations:
dung sai » dung tai, dung va, dung dat
tu sach » thu sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
xa dung » xay dung, xa dong, va dung
hieu le » hieu ve, hieu he, hieu ly
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
le nam » ly nam, he nam, le na
thu xa » thu xac, thu ha, thu xe
cua tu » cua tuc, cua su, cua cu

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