Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
cuu thuc » cuu tac
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
va cham » va chat, va tham
xac va » tac va, ac va, bac va
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu va cham ((xac va) or (duc va)) thanh vi cuu thuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu va cham ((xac va) OR (duc va)) thanh vi cuu thuc*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky nang)) xa hoi. hieu va cham ((xac va) or (duc va)) thanh vi cuu thuc*".