Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va thanh » gia thanh, ban thanh, va tinh
su triet » su tien, ve triet
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
su viet » so viet
y nang » ky nang, ly nang, v nang
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 y nang x ho. hieu va cam tu ((va thanh) or (van hanh)) ki ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang x ho. hieu va cam tu ((va thanh) OR (van hanh)) ki ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: vu sach y nang x ho. hieu va cam tu ((va thanh) or (van hanh)) ki ((su triet) or (su viet))*.