Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dang van » hoang van, hang va
nam thuc » nam thuoc, am thuc, nam thu
tang van » hoang van, trong van, tang luan
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu

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 (thuat sach)) ky ((dang van) or (tang van)) hoc. hieu van nam thuc va dinh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky ((dang van) OR (tang van)) hoc. hieu van nam thuc va dinh va cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky ((dang van) or (tang van)) hoc. hieu van nam thuc va dinh va cuu tre*.