Perhaps you should try some spelling variations:
nang van » tang van, lang van, nong van
dang van » hoang van, hang va
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
qua nam » quan nam, cua nam, quang nam
nam luc » nang luc, nhan luc, nam thuc
hanh ve » hanh vi, hanh va
luc va » duc va, tuc va, loc va
kem » kiem

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 y ((nang van) OR (dang van)) hoi. hieu qua nam luc va ((hanh ve) or (hanh kem)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang van) OR (dang van)) hoi. hieu qua nam luc va ((hanh ve) OR (hanh kem)) su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang van) OR (dang van)) hoi. hieu qua nam luc va ((hanh ve) or (hanh kem)) su triet*".