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