Perhaps you should try some spelling variations:
dung sai » dung tai, dung va, dung dat
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
xa dung » xay dung, xa dong, va dung
hieu he » hieu ve, hiem he, hieu hien
nang ma » tang ma, sang ma, nang cao
hieu le » hieu ve, hieu ly, tieu le
ty nang » ky nang, ty xang, ty hang
thu xa » thu xac, thu ha, thu xe
ma hoi » mai hoi, xa hoi, ma hoa
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 ty nang ma hoi. ((hieu le) OR (hieu he)) 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 ty nang ma hoi. ((hieu le) OR (hieu he)) 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 ty nang ma hoi. ((hieu le) OR (hieu he)) nam thu xa dung sai ((cua tre) or (cua tu))*".