Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh vai » hanh va, hanh tai, hanh van
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, duc va

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 y nang ma hoi. hieu ve cam ((tuc va) or (tuc xa)) ((hanh vai) or (hanh vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu ve cam ((tuc va) OR (tuc xa)) ((hanh vai) OR (hanh vi)) su triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu ve cam ((tuc va) or (tuc xa)) ((hanh vai) or (hanh vi)) su triet*.