Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hanh ca » hanh cac, hanh cat, hanh cua
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
me hoi » le hoi
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((me hoi) or (ma hoa)). hieu va cac truc va hanh ca ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((me hoi) OR (ma hoa)). hieu va cac truc va hanh ca ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((me hoi) or (ma hoa)). hieu va cac truc va hanh ca ((cua tre) or (cua te))*.