Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
kho tang » cao tang
thai cua » than cua, tai cuc, tri cua
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
duc van » duc tan, duc manh, duc phan
su sai » su hai, su dai, su mai
su tai » su thi, tu tai
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: ((su sai) OR (su tai)) kho tang xa hoi. hieu va cac ((duc van) or (duc va)) hanh thai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su tai)) kho tang xa hoi. hieu va cac ((duc van) OR (duc va)) hanh thai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sai) OR (su tai)) kho tang xa hoi. hieu va cac ((duc van) or (duc va)) hanh thai cua su".
• Adding a wildcard symbol may retrieve word variants: ((su sai) OR (su tai)) kho tang xa hoi. hieu va cac ((duc van) or (duc va)) hanh thai cua su*.