Perhaps you should try some spelling variations:
tru nang » tra nang, tri nang, truc nano
sach tru » sach truc, sach thu, sach tu
te sach » toc sach
va hanh » van hanh, va thanh, ban hanh
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, dia danh
vi cua » vai cua, di cua
ve cac » va cac, vien cac
ve cao » va cao, ve bao, ve co
cua tu » cua tuc, cua su, cua cu

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