Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh cac » hang cac, hanh cat, nhanh cay
van hanh » van thanh, ban hanh, van anh
cac cua » cach cua, cac qua, ca cua
luc van » luoc van, luu van, duc van
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
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: su sach ty nang ma hoi. hieu ((ve cam) or (va cam)) luc van hanh cac cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. hieu ((ve cam) OR (va cam)) luc van hanh cac cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu ((ve cam) or (va cam)) luc van hanh cac cua triet*.