Perhaps you should try some spelling variations:
toan hanh » toan thanh, toan anh, tran hanh
toc sach » hoc sach, doc sach, thuoc sach
duc toan » duc tan, duc ton, duc hoan
thai cua » than cua, tai cuc, tri cua
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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. hieu va giao duc toan hanh ((vai cua) or (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. hieu va giao duc toan hanh ((vai cua) OR (thai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoi. hieu va giao duc toan hanh ((vai cua) or (thai cua)) tre*.