Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
thi van » thi lan, thi hanh, thi nang
hang vi » hang va, hanh vi, hang di
luc va » tuc va, loc va
vi cua » vai cua, di cua
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: ((hoc sinh) or (doc sach)) ty lang xa hoi. thi van nam ((luc va) OR (duc va)) hang vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sinh) OR (doc sach)) ty lang xa hoi. thi van nam ((luc va) OR (duc va)) hang vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sinh) or (doc sach)) ty lang xa hoi. thi van nam ((luc va) OR (duc va)) hang vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((hoc sinh) or (doc sach)) ty lang xa hoi. thi van nam ((luc va) OR (duc va)) hang vi cua te*.