Perhaps you should try some spelling variations:
thieu nien » thien nhien
ve triet » va trien
su triet » su viet, su tien
van hanh » van thanh, ban hanh, van ban
nien dat » nen dat, mien dat, nien dau
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
van anh » van thanh, tuan anh, van minh
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang xa hoi. thieu nien dat nuoc ((van hanh) OR (van anh)) vi ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. thieu nien dat nuoc ((van hanh) OR (van anh)) vi ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. thieu nien dat nuoc ((van hanh) OR (van anh)) vi ((su triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. thieu nien dat nuoc ((van hanh) OR (van anh)) vi ((su triet) or (ve triet))*.