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
su viet » so viet
va dam » van dam, va dao, va dau
dam tu » nam tu, cam tu, tam tu
va dan » ca dan, va dao, va dau

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 dam tu ((va thanh) or (va dan)) 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 dam tu ((va thanh) OR (va dan)) ki ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu va dam tu ((va thanh) or (va dan)) ki ((su triet) or (su viet))*.