Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
lang van » dang van, tang van, hoang van
danh vai » danh sai, danh va, doanh van
dat duoc » dat nuoc, da duoc, luat duoc
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
van dat » van dao, van dau, dan dat
lang xa » lang ha, dang xay
duoc ma » duoc lam
ma danh » va danh, ma dan, mo danh
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: doc sach ky ((lang xa) or (lang van)) hoi. hieu van dat duoc ma danh vai ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky ((lang xa) OR (lang van)) hoi. hieu van dat duoc ma danh vai ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky ((lang xa) or (lang van)) hoi. hieu van dat duoc ma danh vai ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: doc sach ky ((lang xa) or (lang van)) hoi. hieu van dat duoc ma danh vai ((cua te) OR (cua tu))*.