Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dang xay » dang van, van xay
danh lai » danh sai, gianh lai, dinh lam
nam duoc » nam thuoc, da duoc, dat duoc
hieu van » hieu va, thien van, lieu va
chau tre » chay tren, chau tho, cho tre
sach ty » sach y, sach tu, sach thu
lam duc » lam duoc, pham duc, lam dung
lang xa » lang ha, lang van
va danh » va dinh, va dan, va hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ty ((lang xa) or (dang xay)) hoi. hieu van ((lam duc) OR (nam duoc)) va danh lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty ((lang xa) OR (dang xay)) hoi. hieu van ((lam duc) OR (nam duoc)) va danh lai chau tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ty ((lang xa) or (dang xay)) hoi. hieu van ((lam duc) OR (nam duoc)) va danh lai chau tre*".