Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » ban thanh, va tinh, le thanh
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nam tu » nam thu, nam thuc
va dan » ca dan, va dao, va dau
ki su » ky su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu van nam tu ((((va thanh) OR (gia thanh))) OR (va dan)) ki su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x ho. hieu van nam tu ((((va thanh) OR (gia thanh))) or (va dan)) ki su triet~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu van nam tu ((((va thanh) OR (gia thanh))) or (va dan)) ki su triet*.