Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
sai kho » dai kho, tai khoa, dai khoa
tang xa » trang xa, tang ma, tang ha
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
duc van » duc tan, duc manh, duc phan
su sai » su tai, su hai, su dai
cua te » cua tu

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 kho ((tang xa) OR (lang xa)) hoi. hieu va cac ((duc van) or (duc va)) hanh thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai kho ((tang xa) OR (lang xa)) hoi. hieu va cac ((duc van) OR (duc va)) hanh thai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai kho ((tang xa) OR (lang xa)) hoi. hieu va cac ((duc van) or (duc va)) hanh thai cua te".
• Adding a wildcard symbol may retrieve word variants: su sai kho ((tang xa) OR (lang xa)) hoi. hieu va cac ((duc van) or (duc va)) hanh thai cua te*.