Perhaps you should try some spelling variations:
xa khanh » xa thanh, van khanh, dat khanh
su sach » so sach, vu sach
xa hanh » xa thanh, va hanh, da hanh
cam tuc » cam xuc, cam tu, nam thuc
ca viet » va viet, co viet, hoa viet
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
ve cam » ve cham, ve cac, va cam
vi ca » vit ca, li ca, va ca

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