Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tinh dat » tinh da, dinh dat, tinh dau
mai khoi » mai khoa, tai khoa, cac khoi
va cham » va chat, va tham
dat cua » dai cua, day cua, mat cua
va tinh » may tinh
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cac, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ((ma hoi) or (mai khoi)). hieu ((va cam) or (va cham)) truc va tinh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((ma hoi) OR (mai khoi)). hieu ((va cam) OR (va cham)) truc va tinh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((ma hoi) or (mai khoi)). hieu ((va cam) or (va cham)) truc va tinh dat cua tre*.