Perhaps you should try some spelling variations:
van chat » cao chat
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
ve chat » va chat
luc van » luoc van, luu van, duc van
lai cua » dai cua, hai cua, lai chau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat song) or (su sach)) ty nang x ho. hieu ((ve chat) OR (van chat)) luc van hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat song) OR (su sach)) ty nang x ho. hieu ((ve chat) OR (van chat)) luc van hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat song) or (su sach)) ty nang x ho. hieu ((ve chat) OR (van chat)) luc van hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: ((thuat song) or (su sach)) ty nang x ho. hieu ((ve chat) OR (van chat)) luc van hanh lai cua viet*.