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

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((y nang) OR (v 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: te sach ((y nang) OR (v nang)) ma hoi. hieu va giao duc toan hanh ((vai cua) OR (thai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (v nang)) ma hoi. hieu va giao duc toan hanh ((vai cua) or (thai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (v nang)) ma hoi. hieu va giao duc toan hanh ((vai cua) or (thai cua)) tre*.