Perhaps you should try some spelling variations:
su triet » su viet, ve triet
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
va danh » va dinh, va dan, va hanh
su tien » su kien, su hien, tu tieng
cam tu » cam thu, nam tu, dam tu

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

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