Perhaps you should try some spelling variations:
bien viet » dien viet, tieng viet, trien viet
toc sach » hoc sach, doc sach, thuoc sach
hanh dao » lanh dao, thanh dat, thanh dam
dao bien » dao tien, dao mien, dau bien
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, duc va
va co » vo co

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 nang xa hoi. hieu va co ((tuc va) OR (tuc xa)) hanh dao bien viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang xa hoi. hieu va co ((tuc va) OR (tuc xa)) hanh dao bien viet".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. hieu va co ((tuc va) OR (tuc xa)) hanh dao bien viet*.