Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
cham loc » cham soc, chon loc, cham o
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
ty lang » tay lang, ty hang, tu lang
loc va » hoc va, luc va
cua tu » cua tuc, cua cu, cua te
cua su » qua 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 lang) OR (ty xang)) xa hoi. hieu vu cham loc va hanh thai ((cua tu) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty lang) OR (ty xang)) xa hoi. hieu vu cham loc va hanh thai ((cua tu) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ty lang) OR (ty xang)) xa hoi. hieu vu cham loc va hanh thai ((cua tu) or (cua su))".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty lang) OR (ty xang)) xa hoi. hieu vu cham loc va hanh thai ((cua tu) or (cua su))*.