Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh viec » tinh viet, dinh viec, sinh viec
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
va tinh » may tinh
nam tuc » nam thuc, nam truc, nam tu
nang ma » tang ma, sang ma, nang cao
tuc va » thuc va, truc va, tuc xa
va nam » van nam, ha nam, va nay
tu sac » tu cac, tu bac, tu lac
tu san » thu san, tu ban, tu can
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) or (tu sach))) or (tu san)) ky nang ma hoi. hieu va nam tuc va tinh viec cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sac) OR (tu sach))) OR (tu san)) ky nang ma hoi. hieu va nam tuc va tinh viec cua triet.
• Adding a wildcard symbol may retrieve word variants: ((((tu sac) or (tu sach))) or (tu san)) ky nang ma hoi. hieu va nam tuc va tinh viec cua triet*.