Perhaps you should try some spelling variations:
manh vai » manh hai, manh va, manh khai
dan manh » dang manh, doan manh, van manh
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ca viet » va viet, co viet, hoa viet
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
va nam » van nam, ha nam, va nay
vai ca » vai cac, vai cua, bai ca
ve nam » he nam, le nam, te nam

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 ((nang xa) OR (nang ma)) hoi. hieu ((ve nam) or (va nam)) thuc dan manh vai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((ve nam) OR (va nam)) thuc dan manh vai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((ve nam) or (va nam)) thuc dan manh vai ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((ve nam) or (va nam)) thuc dan manh vai ca viet*.