Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
cu tren » tu tren
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. hieu van cam xuc va danh di ((cu tren) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van cam xuc va danh di ((cu tren) OR (dua tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van cam xuc va danh di ((cu tren) or (dua tren))*.