Perhaps you should try some spelling variations:
cau tren » cu tren, ca tren, cau treo
dau tren » dau tien, dat tren, dau tieng
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
dau tuc » dau tu, dao tuc, cau truc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va dau » va dao
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang xa hoi. lieu va dau tuc va hanh vi ((cau tren) OR (dau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang xa hoi. lieu va dau tuc va hanh vi ((cau tren) OR (dau tren))".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang xa hoi. lieu va dau tuc va hanh vi ((cau tren) OR (dau tren))*.