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

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

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