Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
doc sach » hoc sach, toc sach, nuoc sach
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu vi » hieu voi, hieu va, hieu ve
vi tham » vi pham, va tham, vi than
vai cua » hai cua, lai cua, mai cua
bai cua » ban cua, bai ca, hai cua
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu vi tham thuc day hanh ((((vai cua) or (bai cua))) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ty nang x hoi. hieu vi tham thuc day hanh ((((vai cua) OR (bai cua))) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: doc sach ty nang x hoi. hieu vi tham thuc day hanh ((((vai cua) or (bai cua))) or (dai cua)) triet*.