Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh ki » thanh kim, thanh ky, thanh ke
hieu ve » hieu va, hieu van
tu cach » tu cac
nang ma » tang ma, sang ma, nang cao
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, duc va
ve cam » ve cham, ve cac, va cam
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (tu sach)) ky nang ma hoi. hieu ve cam ((tuc va) OR (tuc xa)) thanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (tu sach)) ky nang ma hoi. hieu ve cam ((tuc va) OR (tuc xa)) thanh ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (tu sach)) ky nang ma hoi. hieu ve cam ((tuc va) OR (tuc xa)) thanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (tu sach)) ky nang ma hoi. hieu ve cam ((tuc va) OR (tuc xa)) thanh ki su triet*.