Perhaps you should try some spelling variations:
quan cuc » quan chuc, quan cua, quang cua
van quan » van ban
tu sach » thu sach, su sach, te sach
cam tuc » cam xuc, cam tu, nam thuc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
xa van » va van, ha van, ma van
cuc te » cua te, cuc thue, cuc tieu

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) or (hieu qua)) cam tuc xa van quan cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (hieu qua)) cam tuc xa van quan cuc te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu qua)) cam tuc xa van quan cuc te*".