Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
dai khoa » da khoa, tai khoa, dac khoa
thai cua » than cua, tai cuc, tri cua
sai kho » dai kho, tai khoa, mai khoa
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
duc van » duc tan, duc manh, duc phan
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) OR (dai khoa)) mang may hoi. hieu va cham ((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) OR (dai khoa)) mang may hoi. hieu va cham ((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) OR (dai khoa)) mang may hoi. hieu va cham ((duc van) or (duc va)) hanh thai cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sai kho) OR (dai khoa)) mang may hoi. hieu va cham ((duc van) or (duc va)) hanh thai cua te*.