Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
lam duoc » nam duoc, luat duoc, lam thuoc
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
va dinh » van dinh, va kinh, va tinh
duoc va » nuoc va, duc va, duoc ma
van lam » van nam
tang xa » trang xa, tang ma, lang xa
ve cua » le cua, de cua, ve cum
te cua » tue cua, le cua, de 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 (nuoc sach)) kho tang xa hoi. hieu van lam duoc va dinh ((ve cua) OR (te cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (nuoc sach)) kho tang xa hoi. hieu van lam duoc va dinh ((ve cua) OR (te cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (nuoc sach)) kho tang xa hoi. hieu van lam duoc va dinh ((ve cua) OR (te cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (nuoc sach)) kho tang xa hoi. hieu van lam duoc va dinh ((ve cua) OR (te cua)) tre*.