Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
van cac » van hac, van cau, van bac
sach ty » sach y, sach tu, sach thu
thi van » thi lan, thi hanh, thi nang
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
ma hoi » xa hoi, ma hoa, me hoi
dan vi » doan vi, dan va, gan vi

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 ty nang ((ma hoi) or (mai hoi)). thi van cac truc va ((dan vi) or (don vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((ma hoi) OR (mai hoi)). thi van cac truc va ((dan vi) OR (don vi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((ma hoi) or (mai hoi)). thi van cac truc va ((dan vi) or (don vi)) cuu tre*.