Perhaps you should try some spelling variations:
kho tang » cao tang
than cua » nhan cua, ban cua, gian cua
thai cua » tai cuc, tri cua, dai cua
sai kho » dai kho, tai khoa, dai khoa
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
duc van » duc va, duc manh, duc phan
su sai » su tai, su hai, su dai
ve cam » ve cham, ve cac, va cam

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