Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
ve cham » va cham, ve chat, vu cham
su sach » so sach, vu sach
tang xa » trang xa, tang ma, lang xa
sach 2 » sach y
ve cam » va cam, ve cai, ve cau
ve cac » va cac, vien cac
2 tang » 2 thang, 6 tang, 7 tang
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: su sach 2 tang xa hoi. hieu ((((ve cam) or (ve cham))) or (ve cac)) thuc van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 2 tang xa hoi. hieu ((((ve cam) OR (ve cham))) OR (ve cac)) thuc van hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: su sach 2 tang xa hoi. hieu ((((ve cam) or (ve cham))) or (ve cac)) thuc van hanh vi su triet*.