Perhaps you should try some spelling variations:
trang xa » trang va, trang ha, trong xa
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
ban quan » van quan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tang xa » tang ma, lang xa, tang ha
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh

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 ky ((tang xa) or (trang xa)) hoi. hieu van nam thuc va hanh ((ban cua) OR (ban quan)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((tang xa) OR (trang xa)) hoi. hieu van nam thuc va hanh ((ban cua) OR (ban quan)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((tang xa) or (trang xa)) hoi. hieu van nam thuc va hanh ((ban cua) OR (ban quan)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((tang xa) or (trang xa)) hoi. hieu van nam thuc va hanh ((ban cua) OR (ban quan)) triet*.