Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
nam truc » nam truoc, nam trung, nam thuoc
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
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: vu sach ty lang xa hoi. hieu van ((nam truc) or (nam thuc)) ((va danh) OR (va hanh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty lang xa hoi. hieu van ((nam truc) OR (nam thuc)) ((va danh) OR (va hanh)) vi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty lang xa hoi. hieu van ((nam truc) or (nam thuc)) ((va danh) OR (va hanh)) vi cuu tre*".