Perhaps you should try some spelling variations:
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
dinh cuu » dinh chi
kho tang » cao tang
tham soc » cham soc, tham nuoc, thai son
va danh » va dinh, va dan, va hanh
ky tang » ky nang, ky dang, ky trong
soc va » hoc va, loc va, doc va
vi cuu » vi luu, vinh cuu
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky tang) OR (kho tang)) xa hoi. hieu van tham soc va danh ((vi cuu) or (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky tang) OR (kho tang)) xa hoi. hieu van tham soc va danh ((vi cuu) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky tang) OR (kho tang)) xa hoi. hieu van tham soc va danh ((vi cuu) or (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky tang) OR (kho tang)) xa hoi. hieu van tham soc va danh ((vi cuu) or (dinh cuu)) tre*.