Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
toc sach » hoc sach, doc sach, thuoc sach
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
ve hoa » ve khoa, ve hoat, va 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 x ho. ((hieu quan) or (hieu qua)) cam xuc va hanh ve hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x ho. ((hieu quan) OR (hieu qua)) cam xuc va hanh ve hoa viet.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x ho. ((hieu quan) or (hieu qua)) cam xuc va hanh ve hoa viet*.