Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu tieng » luc tieng, tu tuong, tu trong
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
cu tren » dua tren
tu tren » tu truyen, tu trong, dua tren
xuc va » duc va, tuc va, luc va
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu van cam xuc va hanh vi ((cu tren) or (((tu tren) OR (tu tieng))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu van cam xuc va hanh vi ((cu tren) OR (((tu tren) OR (tu tieng)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu van cam xuc va hanh vi ((cu tren) or (((tu tren) OR (tu tieng))))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu van cam xuc va hanh vi ((cu tren) or (((tu tren) OR (tu tieng))))*.