Perhaps you should try some spelling variations:
dang dinh » dang sinh, dang dieu, dang hanh
hieu van » hieu va, thien van, lieu va
thu sac » thu sach, thu san, thu xac
cam duc » cam xuc, cao duc, pham duc
cu treo » cau treo, cau tren
va dang » van dang, va nang, va lang
van cam » van nam, van lam, van cau
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
cu tren » tu tren, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ((ky lang) or (ky tang)) xa hoi. hieu van cam duc va dang dinh ((cu treo) OR (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ((ky lang) OR (ky tang)) xa hoi. hieu van cam duc va dang dinh ((cu treo) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ((ky lang) or (ky tang)) xa hoi. hieu van cam duc va dang dinh ((cu treo) OR (cu tren))".
• Adding a wildcard symbol may retrieve word variants: thu sac ((ky lang) or (ky tang)) xa hoi. hieu van cam duc va dang dinh ((cu treo) OR (cu tren))*.