Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
lang ha » long ha
su viet » so viet
ha hoi » hoa hoi, ha noi, xa hoi
sach v » sach va, sach y, sach vay
sach 2 » sach y
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) or (sach 2)) lang ha hoi. hieu va cac xuc ((van hanh) or (ban hanh)) vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach v) OR (sach 2)) lang ha hoi. hieu va cac xuc ((van hanh) OR (ban hanh)) vi su viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach v) or (sach 2)) lang ha hoi. hieu va cac xuc ((van hanh) or (ban hanh)) vi su viet*.