Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, va tinh
vu sach » vu bach, su sach, vu khach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
cam tu » cam thu, nam tu, dam tu
va cam » va cham, va cac, va cao
ki su » ky su

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 ((ty nang) or (ty hang)) x ho. hieu va cam tu ((va thanh) or (va dinh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty nang) OR (ty hang)) x ho. hieu va cam tu ((va thanh) OR (va dinh)) ki su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty nang) or (ty hang)) x ho. hieu va cam tu ((va thanh) or (va dinh)) ki su triet*.