Perhaps you should try some spelling variations:
khoa mang » khoa dang, khoa mong, khoai lang
dac khoa » da khoa, dai khoa, dau khoa
va thanh » gia thanh, ban thanh, va tinh
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va danh, ban hanh
luu tre » luu tru, cuu tre, luy tre
tu dac » thu dac, tu cac, tu dat
vi luu » vi lua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu dac khoa mang may hoi. hieu va cham soc ((va hanh) OR (va thanh)) vi luu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dac khoa mang may hoi. hieu va cham soc ((va hanh) OR (va thanh)) vi luu tre".
• Adding a wildcard symbol may retrieve word variants: tu dac khoa mang may hoi. hieu va cham soc ((va hanh) OR (va thanh)) vi luu tre*.