Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
dung sai » dung tai, dung va, dung dat
tu sach » su 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
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
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 su » qua su

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