Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cam tuc » cam tu, nam thuc, dam thuc
va hanh » van hanh, va thanh, va danh
y nang » ly nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa
vai va » mai va, dai va, hai va

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 ((y nang) OR (ky nang)) ma hoi. hieu va ((cam tuc) or (cam xuc)) va hanh vai va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) ma hoi. hieu va ((cam tuc) OR (cam xuc)) va hanh vai va trien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ky nang)) ma hoi. hieu va ((cam tuc) or (cam xuc)) va hanh vai va trien*".