Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dieu cua » dieu tra
te sach » toc sach
van cam » van nam, van lam, van cau
va hang » van hang, va nang, va lang
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
xuc va » duc va, tuc va, luc va
de cua » le cua, te cua
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: te sach ((y nang) or (v nang)) x hoi. hieu van cam xuc va hang ((de cua) OR (dieu cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (v nang)) x hoi. hieu van cam xuc va hang ((de cua) OR (dieu cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (v nang)) x hoi. hieu van cam xuc va hang ((de cua) OR (dieu cua)) viet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) x hoi. hieu van cam xuc va hang ((de cua) OR (dieu cua)) viet*.