Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
luc va » duc va, tuc va, loc va
ve cam » ve cham, ve cac, va cam
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: vu sach ky nang ma hoi. hieu ((ve cam) or (va cac)) luc va hanh ca ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ma hoi. hieu ((ve cam) OR (va cac)) luc va hanh ca ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ma hoi. hieu ((ve cam) or (va cac)) luc va hanh ca ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ma hoi. hieu ((ve cam) or (va cac)) luc va hanh ca ((cua triet) OR (va triet))*.