Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
thien van » thi van
na hanh » nha hanh, dna hanh, va hanh
ma hanh » va hanh, da hanh, ban hanh
sach ty » sach y, sach tu, sach thu
te sach » toc sach
hieu va » lieu va, hieu qua
xang co » nang co, lang co, tang co
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty xang co hoi. ((hieu va) or (thien van)) nhan thuc ((ma hanh) or (na hanh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang co hoi. ((hieu va) OR (thien van)) nhan thuc ((ma hanh) OR (na hanh)) vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty xang co hoi. ((hieu va) or (thien van)) nhan thuc ((ma hanh) or (na hanh)) vi cuu tre*.