Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
su viet » so viet
sach v » sach va, sach y, sach 2
va cam » va cham, va cac, va cao
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach v ((nang xa) OR (lang xa)) hoi. hieu va cam xuc van hanh vi su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v ((nang xa) OR (lang xa)) hoi. hieu va cam xuc van hanh vi su viet".
• Adding a wildcard symbol may retrieve word variants: tu sach v ((nang xa) OR (lang xa)) hoi. hieu va cam xuc van hanh vi su viet*.