Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam truc » nam truoc, nam thuc, nam trung
truc may » tren may, truc va
dien cua » dieu cua, dien cuc, dien cu
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky mang may hoi. hieu van nam truc may tinh ((viec cua) or (dien cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky mang may hoi. hieu van nam truc may tinh ((viec cua) OR (dien cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky mang may hoi. hieu van nam truc may tinh ((viec cua) or (dien cua)) triet*.