Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
cac dinh » cac tinh, cac hinh, cac doanh
hieu van » hieu va, thien van, lieu va
lam xuc » cam xuc, lam duoc
van lam » van nam
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
tu sach » su sach, te sach, tu cach
thi du » thi dua, thi dau, thi diu
du tre » duc tre, du tru, dua tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (tu sach)) ty lang xa hoi. hieu van lam xuc ((cac dinh) or (xac dinh)) thi du tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ty lang xa hoi. hieu van lam xuc ((cac dinh) OR (xac dinh)) thi du tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ty lang xa hoi. hieu van lam xuc ((cac dinh) or (xac dinh)) thi du tre*".