Perhaps you should try some spelling variations:
ky trong » ly trong, ke trong, cay trong
thanh vi » hanh vi, thanh va, thanh ve
cuu thuc » cuu tac
tu sach » thu sach, su sach, te sach
ky dang » ky nang, ky danh
qua cac » cua cac
ha hoi » hoa hoi, ha noi, xa hoi
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 trong) or (ky dang)) ha hoi. hieu qua cac ((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 trong) OR (ky dang)) ha hoi. hieu qua cac ((xac va) OR (duc va)) thanh vi cuu thuc.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky trong) or (ky dang)) ha hoi. hieu qua cac ((xac va) or (duc va)) thanh vi cuu thuc*.