Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hoc sach » hoc sinh, hoc cac, hoc anh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
tuc va » truc va, tuc xa, duc va
x hoi » xa hoi, o hoi, x ho
vi ve » va ve, gi ve, ve ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (hoc sach)) ky nang x hoi. hieu ve cham ((tuc va) or (thuc va)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky nang x hoi. hieu ve cham ((tuc va) OR (thuc va)) hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky nang x hoi. hieu ve cham ((tuc va) or (thuc va)) hanh vi ve triet*.