Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
loc va » hoc va
luc va » duc va, tuc va
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
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: vu sach o lang xa hoi. ((hieu ve) or (hieu va)) cam ((luc va) OR (loc va)) thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach o lang xa hoi. ((hieu ve) OR (hieu va)) cam ((luc va) OR (loc va)) thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach o lang xa hoi. ((hieu ve) or (hieu va)) cam ((luc va) OR (loc va)) thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach o lang xa hoi. ((hieu ve) or (hieu va)) cam ((luc va) OR (loc va)) thanh vi cua te*.