Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
su sach » so sach
nang xa » nang x, nang ma, mang xa
vu sach » vu bach, vu khach
lang xa » lang ha, dang xay, lang van
ve cam » ve cham, ve cac, va cam
vi su » va su, ve su, ki su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) van ((nang xa) OR (lang xa)) hoi. hieu ve cam luc van hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) van ((nang xa) OR (lang xa)) hoi. hieu ve cam luc van hanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) van ((nang xa) OR (lang xa)) hoi. hieu ve cam luc van hanh vi su triet*.