Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
thanh de » hanh de, thanh ve, thanh do
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
van hoc » van hoa
hieu va » hieu qua
luc va » tuc va, loc va
de cua » le cua, te cua, dieu 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: tu sach ky lang van hoc. ((hieu va) or (lieu va)) cam ((luc va) OR (duc va)) thanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang van hoc. ((hieu va) OR (lieu va)) cam ((luc va) OR (duc va)) thanh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang van hoc. ((hieu va) or (lieu va)) cam ((luc va) OR (duc va)) thanh de cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang van hoc. ((hieu va) or (lieu va)) cam ((luc va) OR (duc va)) thanh de cua te*.