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
nang ma » tang ma, sang ma, nang cao
cam luc » cau luc
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang ma hoi. hieu van ((cam luc) OR (cam xuc)) va ((lang doi) or (lang dong)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ma hoi. hieu van ((cam luc) OR (cam xuc)) 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. hieu van ((cam luc) OR (cam xuc)) va ((lang doi) or (lang dong)) cu tren".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ma hoi. hieu van ((cam luc) OR (cam xuc)) va ((lang doi) or (lang dong)) cu tren*.