Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
vat danh » va danh, van danh, luat danh
nam thuc » nam thuoc, am thuc, nam thu
dam thuc » am thuc, dan thuc, dai thuc
danh vi » hanh vi, dinh vi, danh di
tu sach » su sach, te sach, tu cach
lang xa » lang ha, dang xay, lang van
ly lang » ly hang, ly vang, le lang
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 (thu sach)) ly lang xa hoi. hieu van ((dam thuc) or (nam thuc)) vat danh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ly lang xa hoi. hieu van ((dam thuc) OR (nam thuc)) vat danh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ly lang xa hoi. hieu van ((dam thuc) or (nam thuc)) vat danh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ly lang xa hoi. hieu van ((dam thuc) or (nam thuc)) vat danh vi cuu tre*.