Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
hieu van » hieu va, thien van, lieu va
vien cua » viec cua, dien cua, bien cua
tien cua » trien cua, tiep cua, dien cua
nam luc » nang luc, nhan luc, nam thuc
va tinh » may tinh
sac ky » cac ky
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sai ky) OR (sac ky)) nang cau hoi. hieu van nam luc va tinh ((vien cua) or (tien cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sai ky) OR (sac ky)) nang cau hoi. hieu van nam luc va tinh ((vien cua) OR (tien cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sai ky) OR (sac ky)) nang cau hoi. hieu van nam luc va tinh ((vien cua) or (tien cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sai ky) OR (sac ky)) nang cau hoi. hieu van nam luc va tinh ((vien cua) or (tien cua)) triet*.