Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cham tuc » pham thuc, tham thuc, cham soc
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
sach ky » sac ky, sach y, sach kem
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: toc ((sach ky) or (sach ty)) nang xa hoi. hieu van ((cham tuc) OR (nham thuc)) va danh du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach ty)) nang xa hoi. hieu van ((cham tuc) OR (nham thuc)) va danh du cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (sach ty)) nang xa hoi. hieu van ((cham tuc) OR (nham thuc)) va danh du cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach ty)) nang xa hoi. hieu van ((cham tuc) OR (nham thuc)) va danh du cua tre*.