Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
dung sai » dung tai, dung dat, dung ha
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu he » hiem he, hieu le, hieu hien
hieu ve » hieu va, hieu van
cua te » cua tu

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