Perhaps you should try some spelling variations:
toan hanh » toan thanh, toan anh, tran hanh
van trieu » tan trieu, van hieu, van tien
toc sach » hoc sach, doc sach, thuoc sach
duc toan » duc tan, duc ton, duc hoan
van tieu » van hieu, van tien, vay tieu
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao

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) OR (toc sach)) y nang ma hoi. hieu va cam duc toan hanh vi ((van trieu) or (van tieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y nang ma hoi. hieu va cam duc toan hanh vi ((van trieu) OR (van tieu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y nang ma hoi. hieu va cam duc toan hanh vi ((van trieu) or (van tieu))*".