Perhaps you should try some spelling variations:
nhanh than » nhanh thanh, nhanh thang, nhanh thai
van nhanh » van thanh, van hanh, van khanh
tai khoa » da khoa, noi khoa
than cua » nhan cua, thai cua, ban cua
sai kho » dai kho, dai khoa, mai khoa
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
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) OR (tai khoa)) tang xa hoi. hieu ve cam duc van nhanh than cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sai kho) OR (tai khoa)) tang xa hoi. hieu ve cam duc van nhanh than cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sai kho) OR (tai khoa)) tang xa hoi. hieu ve cam duc van nhanh than cua tre*.