Perhaps you should try some spelling variations:
su triet » su viet, 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
cam tu » cam thu, dam tu, tam tu
nam tu » nam thu, nam thuc
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 ((cam tu) or (nam tu)) ((va thanh) or (va dan)) ky su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu va ((cam tu) OR (nam tu)) ((va thanh) OR (va dan)) ky su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu va ((cam tu) or (nam tu)) ((va thanh) or (va dan)) ky su triet*.