Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
van hanh » ban hanh, van anh, van ban
vu sach » vu bach, su sach, vu khach
ca viet » va viet, co viet, hoa viet
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
x hoi » xa hoi, o hoi, x ho
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: vu sach thi nang x hoi. hieu ((ve cam) or (va cam)) xuc ((van hanh) OR (van thanh)) vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thi nang x hoi. hieu ((ve cam) OR (va cam)) xuc ((van hanh) OR (van thanh)) vi ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach thi nang x hoi. hieu ((ve cam) or (va cam)) xuc ((van hanh) OR (van thanh)) vi ca viet".
• Adding a wildcard symbol may retrieve word variants: vu sach thi nang x hoi. hieu ((ve cam) or (va cam)) xuc ((van hanh) OR (van thanh)) vi ca viet*.