Perhaps you should try some spelling variations:
te sach » toc sach
tu nang » tru nang, tu nong, tu lang
danh va » doanh va, hanh va, anh va
tu nano » truc nano
va danh » va dinh, va dan, va hanh
va cua » va chua, via cua, ca cua
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
cua te » cua tu

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 ((tu nang) OR (tu nano)) xa hoi. hieu ((ve cam) or (ve cac)) duc va danh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tu nano)) xa hoi. hieu ((ve cam) OR (ve cac)) duc va danh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) OR (tu nano)) xa hoi. hieu ((ve cam) or (ve cac)) duc va danh va cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) OR (tu nano)) xa hoi. hieu ((ve cam) or (ve cac)) duc va danh va cua te*.