Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
dam thuc » am thuc, dan thuc, nam thuc
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
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) or (dam thuc)) ((va thanh) or (va danh)) 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 (dam thuc)) ((va thanh) OR (va danh)) ky su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu va ((cam tu) or (dam thuc)) ((va thanh) or (va danh)) ky su triet*.