Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh tai » thanh tai, hang tai, han tai
hanh dai » hanh dao, vanh dai, thanh dat
cam cua » ca cua, nam cua, cau cua
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
sac ky » sai ky
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((sac ky) OR (cac ky)) nang ma hoi. hieu ve cam cua ban ((hanh dai) or (hanh tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sac ky) OR (cac ky)) nang ma hoi. hieu ve cam cua ban ((hanh dai) OR (hanh tai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sac ky) OR (cac ky)) nang ma hoi. hieu ve cam cua ban ((hanh dai) or (hanh tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: hoc ((sac ky) OR (cac ky)) nang ma hoi. hieu ve cam cua ban ((hanh dai) or (hanh tai)) cua triet*.