Perhaps you should try some spelling variations:
dai truc » dai thuc, doan truc, dai trung
va thanh » gia thanh, ban thanh, le thanh
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
tu tren » tu truyen, tu tieng, tu trong
va dai » va dao, vi dai, va dau
vi tu » vi tut, voi tu, va tu

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 x)) hoi. hieu va dai truc ((va thanh) OR (va tinh)) vi tu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. hieu va dai truc ((va thanh) OR (va tinh)) vi tu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (nang x)) hoi. hieu va dai truc ((va thanh) OR (va tinh)) vi tu tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang x)) hoi. hieu va dai truc ((va thanh) OR (va tinh)) vi tu tren*.