Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ninh viec » ninh viet, dinh viec, sinh viec
cham loc » cham soc, chon loc, hau loc
va ninh » van ninh, va kinh, va tinh
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, tu cach
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
cham o » cham soc

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) or (te sach)) ky nang ma hoa. hieu va ((cham loc) OR (cham o)) va ninh viec cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang ma hoa. hieu va ((cham loc) OR (cham o)) va ninh viec cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang ma hoa. hieu va ((cham loc) OR (cham o)) va ninh viec cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang ma hoa. hieu va ((cham loc) OR (cham o)) va ninh viec cua triet*.