Perhaps you should try some spelling variations:
thien van » thi van
nham thuc » nhan thuc, nam thuc, nham thu
pham thuc » phap thuc, pham chuc, pham thu
dinh dai » dinh dat, sinh dai, dinh dao
lang xa » lang ha, dang xay, lang van
sach ky » sach y, sach ty, sach kem
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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