Perhaps you should try some spelling variations:
dien viet » tieng viet, trien viet, gian viet
viet cac » vien cac, viet ca, viet bac
van hanh » van thanh, ban hanh, van anh
van danh » van doanh, van anh, van manh
vai cuu » vai cua
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cuu tre » cua tre, cau tren, cau treo
cac lo » cac lop, cac co, cac bo

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 ((nang xa) OR (nang ma)) hoi. dien viet cac lo ((van danh) or (van hanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang ma)) hoi. dien viet cac lo ((van danh) OR (van hanh)) vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) OR (nang ma)) hoi. dien viet cac lo ((van danh) or (van hanh)) vai cuu tre*".