Perhaps you should try some spelling variations:
hoang van » hang va
toc sach » hoc sach, doc sach, thuoc sach
danh sai » dung sai, danh bat, danh dau
lam duoc » nam duoc, luat duoc, lam thuoc
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
van lam » van nam
lang xa » lang ha, dang xay, lang van
duoc va » nuoc va, duc va, duoc ma
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((lang xa) or (hoang van)) hoi. hieu van lam duoc va danh sai ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang xa) OR (hoang van)) hoi. hieu van lam duoc va danh sai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((lang xa) or (hoang van)) hoi. hieu van lam duoc va danh sai ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) or (hoang van)) hoi. hieu van lam duoc va danh sai ((cuu tre) OR (cau treo))*.