Perhaps you should try some spelling variations:
van triet » va triet, van thiet, van trieu
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoi » cau hoi, co hoi, cao hoc
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 cao hoi. hieu van nam ((xuc va) or (tuc va)) hanh vi van triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang cao hoi. hieu van nam ((xuc va) OR (tuc va)) hanh vi van triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang cao hoi. hieu van nam ((xuc va) or (tuc va)) hanh vi van triet*.