Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, lieu va
cham tuc » nham thuc, tham thuc, cham soc
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
va danh » va dinh, va dan, va hanh
danh du » danh dau, danh tu, dinh du
cua tre » cua te, cuu tre, cua triet
du cua » duy cua, dau cua, dum cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky ((nang xa) OR (lang xa)) hoi. hieu van ((cham tuc) or (pham thuc)) va danh du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((nang xa) OR (lang xa)) hoi. hieu van ((cham tuc) OR (pham thuc)) va danh du cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((nang xa) OR (lang xa)) hoi. hieu van ((cham tuc) or (pham thuc)) va danh du cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang xa) OR (lang xa)) hoi. hieu van ((cham tuc) or (pham thuc)) va danh du cua tre*.