Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
nam luc » nang luc, nhan luc, nam thuc
va danh » va dinh, va dan, va hanh
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
di cua » doi cua, de cua, do cua
x hoi » xa hoi, o hoi, 5 hoi

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) or (x ho)). hieu van nam luc va danh ((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) OR (x ho)). hieu van nam luc va danh ((di cua) OR (dai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((x hoi) or (x ho)). hieu van nam luc va danh ((di cua) or (dai cua)) viet*.