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

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