Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sinh viec » sinh vien, dinh viec, ninh viet
tinh viec » tinh viet, dinh viec, tich viec
va nang » van nang, da nang, cam nang
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
hieu va » lieu va, hieu qua
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 sach ky ((nang ma) OR (tang ma)) hoi. hieu va nang luc va ((tinh viec) or (sinh viec)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (tang ma)) hoi. hieu va nang luc va ((tinh viec) OR (sinh viec)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ma) OR (tang ma)) hoi. hieu va nang luc va ((tinh viec) or (sinh viec)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) OR (tang ma)) hoi. hieu va nang luc va ((tinh viec) or (sinh viec)) cua triet*.