Perhaps you should try some spelling variations:
dinh cuu » dinh chi
vinh cuu » sinh cua, dinh cu, tinh cua
hieu van » hieu va, thien van, lieu va
tuan doc » quan doc, tuan do, thuat doc
te sach » toc sach
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
ha hoi » hoa hoi, ha noi, xa hoi

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 dang ha hoi. hieu van ((tuan doc) OR (than doc)) va hanh ((vinh cuu) or (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ha hoi. hieu van ((tuan doc) OR (than doc)) va hanh ((vinh cuu) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ha hoi. hieu van ((tuan doc) OR (than doc)) va hanh ((vinh cuu) or (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ha hoi. hieu van ((tuan doc) OR (than doc)) va hanh ((vinh cuu) or (dinh cuu)) tre*.