Perhaps you should try some spelling variations:
bien viet » dien viet, tieng viet, trien viet
hanh dao » lanh dao, thanh dat, thanh dam
dao bien » dao tien, dao mien, dau bien
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
qua co » qua con, cua co, qua ca
co tuc » co thuc, co tu, co toc
tuc va » thuc va, truc va, tuc xa

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 ky) or (sach y)) nang xa hoi. hieu qua co tuc va hanh dao bien viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang xa hoi. hieu qua co tuc va hanh dao bien viet.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang xa hoi. hieu qua co tuc va hanh dao bien viet*.