Perhaps you should try some spelling variations:
thien van » thi van
nham thuc » nhan thuc, nam thuc, nham thu
dinh dai » dinh dat, sinh dai, dinh dao
cham tuc » pham thuc, tham thuc, cham soc
doc sach » hoc sach, toc sach, nuoc sach
lang ha » long ha
sach ky » sac ky, sach y, sach ty
lang xa » dang xay, lang van
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet

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

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