Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
ban hanh » ban hang
sach ty » sach y, sach tu, sach thu
va danh » va dinh, va dan, va hanh
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
vi su » va su, ve su, ki su

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 ty nang xa hoi. hieu ((ve cam) or (ve cac)) tuc ((ban hanh) or (va danh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang xa hoi. hieu ((ve cam) OR (ve cac)) tuc ((ban hanh) OR (va danh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang xa hoi. hieu ((ve cam) or (ve cac)) tuc ((ban hanh) or (va danh)) vi su triet*.