Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh vien » sinh vien, tinh dien, tinh viet
hieu van » hieu va, thien van, lieu va
vien cua » viec cua, dien cua, tien cua
nam thuc » nam thuoc, am thuc, nam thu
va tinh » may tinh
nam luc » nang luc, nhan luc, nam duoc
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky
ma hoi » mai hoi, xa hoi, ma hoa

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

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