Perhaps you should try some spelling variations:
qua nhan » cua nhan, qua nhat, qua phan
su sach » so sach, vu sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
dao cua » dai cua, day cua, dan cua
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

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 lang) or (ky tang)) xa hoi. hieu qua nhan ((luc va) OR (tuc va)) lanh dao cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky tang)) xa hoi. hieu qua nhan ((luc va) OR (tuc va)) lanh dao cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) or (ky tang)) xa hoi. hieu qua nhan ((luc va) OR (tuc va)) lanh dao cua tu*".