Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
bao duc » dao duc, bao luc, cao duc
van bao » van ban, van dao
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cua » de cua, te cua, ve cum
le cua » ly cua

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) or (thuat sach)) ky lang xa hoi. hieu van bao duc ban thanh ((ve cua) OR (le cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky lang xa hoi. hieu van bao duc ban thanh ((ve cua) OR (le cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky lang xa hoi. hieu van bao duc ban thanh ((ve cua) OR (le cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky lang xa hoi. hieu van bao duc ban thanh ((ve cua) OR (le cua)) tre*.