Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
dinh dai » dinh dat, sinh dai, dinh dao
tham tuc » tham thuc, thai tuc, pham thuc
xa dinh » xac dinh, va dinh, ba dinh
sach ty » sach y, sach thu, xach tay
sang ma » tang ma, nang ma, sang tao
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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 ty) or (sach tu)) sang ma hoi. lieu va ((tham tuc) OR (nham thuc)) xa dinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach tu)) sang ma hoi. lieu va ((tham tuc) OR (nham thuc)) xa dinh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) or (sach tu)) sang ma hoi. lieu va ((tham tuc) OR (nham thuc)) xa dinh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach tu)) sang ma hoi. lieu va ((tham tuc) OR (nham thuc)) xa dinh dai cua tre*.