Perhaps you should try some spelling variations:
su triet » su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va hanh » van hanh, va danh, ban hanh
su viet » so viet
va cam » va cham, va cac, va cao
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 va cam tu ((va thanh) or (va hanh)) ki ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu va cam tu ((va thanh) OR (va hanh)) ki ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x ho. hieu va cam tu ((va thanh) or (va hanh)) ki ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu va cam tu ((va thanh) or (va hanh)) ki ((su triet) OR (su viet))*.