Perhaps you should try some spelling variations:
lang dong » lang trong, lao dong, cong dong
hieu van » hieu va, thien van, lieu va
lang doi » hang doi, lang dai, lang cuoi
cu tren » tu tren, dua tren
cam loc » cam lo
van cam » van nam, van lam, van cau
san ky » sang ky, van ky, dan ky
loc va » hoc va, luc va
ma hoi » mai hoi, xa hoi, me hoi
tu san » thu san, tu ban, tu can

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ((ma hoi) OR (ma hoa)). hieu van cam loc va ((lang doi) OR (lang dong)) cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang ((ma hoi) OR (ma hoa)). hieu van cam loc va ((lang doi) or (lang dong)) cu tren~".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((ma hoi) OR (ma hoa)). hieu van cam loc va ((lang doi) or (lang dong)) cu tren*.